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1.
There are both many good things and many potential dangers in social network
It's important for parents to teach their children how to use social media wisely
Social network is the start of bad things like cyberbullying
2.
A recent report has said that many teenagers have contacted online with strangers and it makes them feel scared or uncomfortable.
Others receive onine advertising that is inapproriate for their age.
It is important that parents should be aware of what children are doing online.
Parents should make their children understand that they respect children's privacy.
However, parents want to make sure that their children are safe.
cảm ơn trước 
Từng tranh theo từ trên xuống và qua rồi đó bạn ^^ hay để mình chụp từng bài gửi nha
mn ktra giúp mk vs, câu nào sai nhắc mk nhe
cau 4 thieu than a tourist does cai cho revision for test
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V.
1) I help you 6) is your address
2) for 7) What is your phone
3) fill in 8) What do you
4) your full name 9) going
5) When were you 10) taking
VI.
MỆT QUÁ! MIK CHỈ LÀM ĐC ĐẾN ĐÂY THÔI THÔNG CẢM CHO MIK NHA MUỘN RỒI
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Exericse V:
31. B
32.C
33.C
34.A
35.D
Exercise VI:
36. A
37. D
38. C
39. C
40. C
Exercise VIIz;
41. D. time enough \(\rightarrow\)enough time
42. C. rises \(\rightarrow\) is rising
43. C. isn't telling \(\rightarrow\) don't tell
44. C. with \(\rightarrow\) \(\varnothing\)
45. C. taller \(\rightarrow\) tallest
Exercise VIII"
46.D
47.A
48.C
49.B
50.A
1 Sue wishes she hadn't bought that new book
2 Unless you walk faster, you will be late
3 Carol spent 2 hours fixing the television sets
4 I make these handicrafts by myself
5 If I were you, I would take the bus instead of the train
II
1 She doesn't have to get up early on Saturday
2 Children mustn't be left alone in car
3 John must explain this if he want his student to succeed
4 I have to file the report this week
5 We don't have to work overtime on Saturdays
6 You mustn't drive more than 25 mph in this zone
7 She didn't have to attend the presentation yesterday
8 She has to pick up her children at school
9 You don't have to arrive before 8
10 They had to visit the doctor yesterday as they didn't feel well