When you ride a bicycle, motorised foot scooter or a personal mobility device a segway, you must wear an Australian Standard (AS) approved bicycle helmet. You must securely fit and fasten it. An approved bicycle helmet means a helmet that complies with AS 2063 or AS/NZS 2063.

You may only carry passengers on your bicycle if the bicycle is designed to carry passengers. If you carry a passenger on your bicycle, they must also wear an approved helmet, securely fitted and fastened. However, if they are a paying passenger on a 3 or 4 wheeled bicycle, they do not have to wear a helmet.

You do not need to wear a helmet if you have a doctor's certificate stating that, for a specific amount of time, you cannot wear a helmet:

• for medical reasons
• because of a physical characteris that makes it unreasonable for you to wear one.

If you have a doctor's certificate, you must carry it with you when you ride without a helmet.

You also do not need to wear a helmet if you are a member of a religious group and are wearing a headdress customarily worn by your group, that makes it impracal to wear a helmet.

Attaching a camera

There is no law that prohibits the attachment of a camera to a bicycle helmet, as long as the helmet remains compliant with the above mentioned standards, and is an approved attachment (according to the helmet manufacturer).

You may use a camera mounted on your bicycle or a body mounted camera as an alternative.

Bicycle equipment

Every time you ride, your bicycle must have:

• at least 1 working brake
• a working bell, horn or a similar warning device.

Bicycle equipment for night time and unsafe weather

If you ride at night or in weather conditions that make it difficult to see, you must display (either on the bicycle or on you):

• a white light (flashing or steady) that can be clearly seen at least 200m from the front of the bicycle
• a red light (flashing or steady) that can be clearly seen at least 200m from the back of the bicycle
• a red reflector that can be clearly seen at least 50m from behind the bicycle—when a vehicle's headlights shine on it.

When you ride a bicycle, motorised foot scooter or a personal mobility device a segway, you must wear an Australian Standard (AS) approved bicycle helmet. You must securely fit and fasten it. An approved bicycle helmet means a helmet that complies with AS 2063 or AS/NZS 2063.

You may only carry passengers on your bicycle if the bicycle is designed to carry passengers. If you carry a passenger on your bicycle, they must also wear an approved helmet, securely fitted and fastened. However, if they are a paying passenger on a 3 or 4 wheeled bicycle, they do not have to wear a helmet.

You do not need to wear a helmet if you have a doctor's certificate stating that, for a specific amount of time, you cannot wear a helmet:

for medical reasons
because of a physical characteris that makes it unreasonable for you to wear one.
If you have a doctor's certificate, you must carry it with you when you ride without a helmet.

You also do not need to wear a helmet if you are a member of a religious group and are wearing a headdress customarily worn by your group, that makes it impracal to wear a helmet.

Attaching a camera

There is no law that prohibits the attachment of a camera to a bicycle helmet, as long as the helmet remains compliant with the above mentioned standards, and is an approved attachment (according to the helmet manufacturer).

You may use a camera mounted on your bicycle or a body mounted camera as an alternative.

Bicycle equipment
Every time you ride, your bicycle must have:

at least 1 working brake
a working bell, horn or a similar warning device.
Bicycle equipment for night time and unsafe weather
If you ride at night or in weather conditions that make it difficult to see, you must display (either on the bicycle or on you):

a white light (flashing or steady) that can be clearly seen at least 200m from the front of the bicycle
a red light (flashing or steady) that can be clearly seen at least 200m from the back of the bicycle
a red reflector that can be clearly seen at least 50m from behind the bicycle—when a vehicle's headlights shine on it.

Dear Mary,

I'm fine. And you? I'm very glad writing letter to you. I will tell you about one of my most memorable past experiences. Last month, my mother told me to bring a raincoat before I went to school but I did not obey. When I went home, suddenly it rained. It rained more and more heavily. I decided to go home in rain without raincoat. That night, I'm seriously ill. I was pity when seeing my parents looked after me and worry about me.

I hope you won't do it as me. I look forward to hearing from you soon.

Your friend,

Dear Jenny,

Last night I had a scary dream. I was walking along an empty street late at night. Suddenly a lion appeared at the end of the street. He ran toward me with his big mouth open and sharp teeth. He roared and jumped upon me. I screamed loudly and awoke. I'm still frightened now. By the way, how have similar problems now. Write to me as soon as possible.

Your friend,

Son

I think bicycles are the best transport in Vietnam. It is convenient and good for health. Riding a bicycle, I can develope a strong heart and muscular limbs. Using a bike for transportation also can help you lose weight and improve your overall health. In city or countryside, when you ride bicycle, you don't need to worry about parking problems and can save money on fuel. Morever, bicycles are only means of transport with don't pollute the environment. Those are some reasons why bicycles are the best means of transport in Vietnam.

I think bicycles are the best transport in Vietnam. It is convenient and good for health. Riding a bicycle, I can develope a strong heart and muscular limbs. Using a bike for transportation also can help you lose weight and improve your overall health. In city or countryside, when you ride bicycle, you don't need to worry about parking problems and can save money on fuel. Morever, bicycles are only means of transport with don't pollute the environment. Those are some reasons why bicycles are the best means of transport in Vietnam.
❤☺

OR

I'd a bicycle and I think bicycle is the best means of transport in Vietnam, because if you want to perfectly feel the atmosphere of Vietnam daily life, hire one bicycle and ride around the city in the early morning. in Hanoi, you can see the early morning market, parks in the morning with exercises of local people, Hanoi streets with not many vehicles.

31. I’d better have a shower. I haven't had one since Thursday.
32. I don’t live with my family now and we haven't seen each other for five years.
33. Look! It is raining

My mother is cookingat the  moment.
35. How long did you know each other?
36. Did you take many photographs on your last holiday ?
37.Has she eaten at the Royal Hotel yet ?
38.Does he live here ? 

39. ShevisitedHanoi last year.

40. Mai sometimes goes out with her friends.

1.In 201,51,515 people attended Burning Man. (How many)​​

How many people attend Buring Man in 20115?

2.some youngsters accidentally knocked over one of the giants.(what)

What did some youngsters do ?

3.The highlight of the festival is the tomato fight.(what)

What is the highlight of the festival?

​4. La Tomatina dates back to 1945 when an annual parade of enormous figures with big heads was passing through the streets of Bunyol.(when)

When did La Tomatine date back?

5. La Tomatina in Bunol near Valencia happens every year.(How often)

How often La Tomatina in Bunol near Valencia?

6.La Tomatina takes place on the last Wednesday in August.(when)

When does La Tomatina take place?

7.The festival began in San Francisco's Baker Beach in 1986.(when,where)

When and where did the festival begin?

8.it takes its name from the ritual burning of a large wooden model of a hated person.(what)

What does ti take its name from?

9.Burning Man lasts one week.(How Long)

How long does the Buring Man last?

10.The event begins on the last Monday in August,and ends on the first Monday in September.(when)

When does the event begin?

học tốt

1. Do you mind if I smoke?
2. A doll's house is made by a little boy.
3. It's interesting to go swimming in the summer.
4. John was not feeling well enough to go to school.
5. To stay healthy, jogging is a good morning exercise.
6. The little girl is mistreated by her step-mother.
7. Every day, thousands of trees are cut down all around the world.
8. Children should go to school.
9. The repairman, Tam, is repairing my sister's bike.
10. The shoes made from old car tires are beautiful.

1. What time…is he………… here? - He ……is….. here in half an hour.

2. Mary promise she  ……will get up……… early. She promise ……will come…… to the meeting in time.

3. I ………am going to be………… ready in five minutes.

4. I want to speak to Professor Wilson when he ………is………… free.

5. Many people …………will attend……………. the concert tomorrow night.

6.…………Does he help…………….. them last Sunday?

7. His father ………………works……….there for 10 years.

8. ………Many people will attend………………………………. the concert last night?

9. Does Nam promise  ……………lend…….. you his bicycle?

10. My father ……………haven't worked…………. with Mr Bill since 2010.

11.I’d you …………to meet……… my grandparents.

12.We enjoy ……………going……fishing at weekends.

13.The woman ……………sits…… near my mother is Aunt Chi.

14.Would you mind ……………leaving……the door open ?

15.The book ………………is written… by a famous author.

16.I ……………have worked…… with him since 1990.

17.How long ……have……………you ………studies………… English?

18.Do you mind if I …………see………this newspaper? 4

19.Yesterday morning …………was………  Tuesday, we …………had………an English test.

20.At this time last year, my sister ……worked…………… in China.

21.Where ………will…………you…go………………tomorrow evening?

22.We …………haven't gotten……… in touch with him for years.

23.It’s difficult …remember………………all the instructions at the same time.

24.I ……visited……………Cuba in 1982.

25.My father never ……………drinks…… coffee at night.

26.At the moment, we ………are doing………… English exercises.

27.The house ……………paints……blue is my aunt’s.

28.I can hear she ……………sings…… a Russian song. 

\(A=\frac{n-2}{n+3}\)

a) Để A là phân số khi n+3 khác 0 ( n thuộc Z)

vậy n khác -3 ( n thuộc Z ) thì A là phân số

b) Để A nguyên khi n-2 chia hết cho n+3

mà n+3 chia hết cho n+3

suy ra n+3-(n-2) chia hết cho n+3

suy ra 5 chia hết cho n+3

n +3 \(\in\left\{1;-1;5;-5\right\}\)

n \(\in\left\{-2;-4;2;-8\right\}\)

Thử lại 

\(B=\frac{10n-3}{4n-10}=\frac{\left(4n-10\right).\frac{5}{2}+22}{4n-10}\)

\(B=\frac{5}{2}+\frac{22}{4n-10}\Rightarrow B=\frac{5}{2}+\frac{11}{2n-5}\)

ĐỂ B đạt GTLN khi \(\frac{11}{2n-5}\)đạt GTLN, điều này xảy ra khi 2n - 5  là số nguyên dương nhỏ nhất,

tức là 2n-5=1 suy ra 2n=6 suy ra n=3

Khi đó \(B=\frac{10.3-3}{4.3-10}=\frac{27}{2}\)

Vậy B có GTLN là 27/2 khi n

Living in the city is more interesting but noisy than live in the cuntryside

1. noisier / interesing/ the countryside/ than/ Living/ more/ in/ be/ live/ in/ the city/ but.

Living in the city is noisier but more interesing  than live in  the countryside

2. enjoy/ here/ go/ you/ or/ Do/ move/ you/ stay/ be?

(1) was invented                                                    (1) When was nylon invented?

(2) work                                                                  (2) Who invented nylon?

(3) was introduced                                                  (3) When was nylon introduced to the world? 

(4) became                                                              (4) What was the best present for many women during the Second World War?

(5) was used                                                            (5) How long has nylon played an important part in our lives?

(6) is found

(7) has played

(8) will be manufactured

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