I choose the best answer
1. some whales migrate into warm waters to bear their ........
a. young b. diests c. calves d. young whales
2. whales feed on krill
a. tiny shellfish b. small fish c. sea plants d. small animals
3. ........ is the variety of different types of plant and animal life in a particular region
a. interaction b. herbicide c. environment d. biodiversity
4. he is a ........biologist. he spends all his life studying sea plants and animals
a. ocean b. marine c. botany d. sea
5. ........ is a chemical used for killing-weeds
a. pesticide b. herbicide c. fertilizer d. antibiotic
6. we all enjoyed the waters of timor sea and the coral reefs that lie ........
a. under b. behind c. beneath d. beside
7. some tiny organism are ........ along by the currents
a. carried b. taken c. flowed d. moved
8. sperm whales are ........ , which means they eat meat
a. herbivores b. carnivores c. omnivores d. mammals
9. sperm whale populartion are at risk due to hunting
a. in extinction b. in danger c. on the decrease d. in fewness
10. these birds ........ to north africa in winter
a. settle b, go c. relocate d. migrate

V write the questions which the words given.

1 nga goes to le loi school. (which/what school..........)

What school does Nga go ?

2 she has two children. ( how many............)

How many children does have?

3 I have one brother .( how many brother...)

how many brothers do you have?

4 nga goes to bed at ten o`clook. (what time.....)

what time does Nga go to bed?

5 they listen to music in the evening.(when ...)

when do they listen to music?

6 Mr thanh works in the hospital.(where.....)

where does Mr Thanh work ?

EXERCISE II: Add tag questions to the following.

11. can't they

12. did they

13. did it

14. aren't I

15. is it

16. aren't they

17. have you

18. was it

19. hadn't he

20. don't you

EXERCISE III:

1. do you

2. have they

3. would you

4. had he

5. shall we

6. isn't it

7. aren't I

8. isn't there

9. will he

10. aren't you

11. have you

12. didn't you

13. don't they

14. can't you

15. could you

EXERCISE II:

1. don't they

2. isn't she

3. will the

4. isn't it

5. are there

6. doesn't he

7. wouldn't he

8. are they

9. have you

10. isn't it

EXERCISE I: Add tag questions to the following.

13. is it

14. did they

15. isn't it

16. didn't they

17. is it

18. shall we

19. will you

20. will you

21. isn't it

22. does she

23. didn't you

24. does he

EXERCISE I:

1. doesn't she

2. did he/she

3. won't they

4. can't she

5. may she

6. shouldn't we

7. hasn't she

8. does he

9. have you

10. isn't it?

11. did they

12. aren't I

chu vi là 

25 x 4 = 100 (m)

 diện tích là 

25 x25 = 625 (m2)

do ab=c 

bc=4a

ac=9b

suy ra : a x b x b =4xa

tương đương b x b = 4

suy ra b = 2

tương tự a =3

Đáp án