III/

1. How far is it from your house to your school?

2. It is not very far to go to the railway station.

3. We must always obey the traffic rules for our safety 

4. There is a children crossing sign near our school so you must cross the road there.

5. My mother used to take me to school but now I cycle there.

IV/

1. Hình như bạn làm rồi

2. My brother used to be a professor at Ha Noi university.

(Học giỏi nha bạn) 

II.

1. How far is it from your house to your school?

2. It is not very far to go to the railway station.

3. We must always obey the traffic rules for our safety.

4. There is a children crossing sign near our school so you must cross the road there.

5. My mother used to take me to school but now I cycle there.

IV.

1. more cars on the road than before

2. to be a professor at Ha Noi university some years ago, but now he has a job as an engineer at a big company.