1. It's very important to keep the environment clear.

2. Lan is lazier than Nga.

3. Mr.Ba spent half an hour walking to work yesterday.

4. Lan has two older sisters.

5. Our house is the oldest in the living centre.

6. I prefer listening to music to watching TV.

    I'd rather listen to music than watch TV.

7. Trung wasn't at school last Tuesday.

8. It is very interesting to have a vacation.

9. Doing this exercise is difficult for me.

    This exercise is too difficult for me to do.

    It is difficult for me to do this exercise.

10. Lan's sister is less intelligent than her.

      Lan's sister isn't as intelligent as her.

11. Because it is rainy, the train can't run.

      The rain prevents the train from running.

12. Your chickens produce fewer eggs than mine.

D) students

Đếm được dùng how many

1T

2F

3T

4F

5F

He visited his grandparents yesterday.

They went to the countryside last week.

He visited his grandparents yesterday.

 They went to the countryside last week.

How often do you study English?

It often rains on Wednesdays.

She does not go to school.

Does Billy work in the supermarket?

Jenny buys a newspaper every Saturday.

is - lives - travels - sings - writes - makes - likes - goes - reads - like

If they had departed earlier, they wouldn't find themselves caught in traffic.

They wouldn't have gotten stuck in traffic if they had left early, 

1. D

2. D

3. D

4. B

5. B

6. D

7. D

8. D

9. B

10. D