I.

1.D

2.D

3.B

4.D

5.D

II.

1.My mom used to live to live in a village when she was a girl.

2.There did not used to be many vehicles on the roads before.

3.We weren't used to cycle to school two years ago.

4.Now there are used to be many traffic accidents.

5.My uncle used to be a bus driver some years ago.

III.

1.We weren't used to go to school by bus.

2.He used to ride a bike for exercise.

3.Was Tim use to be a taxi driver?

4.He wasn't used to smoke ten cigarettes a day.

5.Were you use to wearing a helmet while riding a motorbike?

6.There used to be many trees on this street.

III.

1. We didn't use to go to school by bus.

2. He used to ride a bike for exercise.

3. Did Tim use to be a taxi driver?

4. He didn't use to smoke ten cigarettes a day.

5. Did you use to ride a motorbike without wearing a helmet?

6. There used to be many trees on this street.

P/S: Bạn ý chỉ bảo làm bài 3 thôi nên đừng có xóa nha ad'-'