III. Circle the best option A, B, C or D to complete the following sentences:
1. My friends and I often do our __________ after school.
A. homework B. football C. science D. lessons
2. Duy __________ to school every day.
A. cycle B. cycles C. is cycling D. is cycles
3. My friend has a sister, but she ________ a brother.
A. don’t have B. not has C. doesn’t have D. isn’t have
4. My ________ house is in Ha Noi.
A. grandmother B. grandmothers C. grandmother’s D. grandmothers’s
5. Where is ________ bike?
A. Minh’s B. Minhs’ C. Minhs’s D. Minhs
6. The dog _______ on the chair.
A. be B. is C. am D. are
7. The cats _________ under the table.
A. are B. is C. am D. be
8. The table is between the sofa _________ the lamp.
A. but B. and C. of D. to
9. Nam is __________. He likes helping his friends.
A. careful B. shy C. clever D. kind
10. Let’s _________ to the library this afternoon.
A. going B. to go C. go D. goes
11. – “Where’s Lisa?”
- She’s ___________ Mum in the kitchen.
A. helping B. helps C. is helping D. help
12. _____ they ______reading books in the library? – Yes, they are.
A. Is/ reading B. Are/reading C. Am/reading D. Do/read
13. Look! He _________ play football now.
A. playing B. plays C. is playing D. play
14. Apples ________ good for our health.
A. are B. is C. am D.be
15.She’s a good student. She _________ does her homework on time.
A. never B. rarely C. usually D. sometimes
16. Laura is very _________. She is always entertaining us with jokes and stories.
A. confident B. funny C. caring D. creative
17. There are some pictures ________ the wall in my bedroom.
A. on B. in C. under D. in front of
18. Mr Nam ________ history at our school.
A. teach B. teaches C. teaching D. to teach
19. We often use a __________ in a maths class.
A. bike B. uniform C. compass D. picture book
20. My best friend ________ to school every day. She cycles.
A. not walk B. don’t walk C. isn’t walk D. doesn’t walk
Xếp thành hàng 12, 15, 18 hàng đều thừa 5 hs
=> x‐5 thuộc BC ﴾12; 15; 18﴿ và 200<x‐5<400
BCNN ﴾12; 15; 18﴿
12= 222.3
15= 3.5
18= 2.322
BCNN (12; 15; 18) = 222.322.5 = 4.9.5 = 180
BC (12; 15; 18)= B(180) = {0;180;360;540;......}
mà 200<x‐5<400
nên x‐5=360
x= 360+5= 365
vậy số học sinh khối 6 đó là 365 hs
TL
Ta có :
BCNN (12,15,18)=180
Vậy số học sinh khi bớt đi 1 là một bội của 180, do đó bằng 180 k với k là một số tự nhiên.
Theo đề bài ta có
200<180 k<400
<=>1<k≤2
Vậy k=2 và số học sinh của trường khi bớt đi 1 là 180.2=360
Vậy số học sinh của trường đó là :
360+1=361 (học sinh)
Đs : 361 học sinh
HT