I. 

1. What can we do to reduce congestion traffic in big cities?

2. How far is it from your hotel to the train station?

3. It is not very far from my house to school.

4. I think it's time to do something to reduce traffic jams in Vietnam.

5. Mai used to go to school on foot when she was in primary school.

6. There are often traffic jams in the city centre in rush hour.

7. People in the past didn't use to worry about traffic congestion.

8. It is compulsory to wear a helmet when riding a motorbike in Vietnam.

II.

1. I used to go swimming every Tuseday when I was at school.

2. Mai went to school on foot when she was in primary school.

3. How about cycling to the town at weekend?

4. It is about 2 kilometers from my house to the nearest bookstore.

5. The hotel is near the airport.

6. How far is it from Madrid to Barcelona?

7. Make a left turn in Lavalle and then go straight ahead.

8. Did your father use to travel to work by car?

IV.

1. Have you ever driven

2. flew

3. are learning

4. walks; is riding

5. lost

6. will buy

7. taught

8. to be

9. to drive

10. go

V.

1. obidience

2. safety

3. unhealthy

4. carelessly

5. illegal

6. flight

7. strictly

8. signalled

9. prohibitive

10. warning

VI.

1. used -> use

2. with -> without

3. use -> used

4. on a limit speed sign -> of the limit speed sign

5. It -> It is

6. a cheap -> cheap

7. for -> of

8. fast -> slow

VII.

1. f        2. a         3. e          4. b         5. h          6. c         7. d         8. g

ĐÁP ÁN ĐÂY =))))) 
Writing 
I 
1 What can we do to reduce traffic congestion in big cities?
2.How far it is from your train stion to the hotel?
3.It is not very far from my house to school.
4.I think it's time to Vietnam do something to reduce traffic jams.
5.Mai used to go to school on foot when she was in primary school.
6.There are often traffic jams in the rush hours in the city center.
7.People didn't use to worry about traffic congestion in the past.
8.It is compulsory to wear a helmet when riding a motorcycle in Vietnam.
II
1.I used to go swimming on Thursday when I was at school.
2.Mai went to school on foot when she was in primary school.
3.How about we cycle to the town at the weekend.
4.It is about 2 kilomentres from my house to the nearest bookstore.
5.The hotel is near the airport.
6.How far it is from Madrid to Barcelona?
7.Make a left turn into Lavalle Street then go straight ahead.
8.Did your father use to travel to work by car?
IV
1.Have you ever driven
2.flew
3.are learning
4.walks/rides
5.lost
6.would buy 
7.taught
8.to be
9.to drive 
10.go
V
1.obeisance
2.safety
3.unhealthy
4.uncarefully
5.illlegal
6.flight
7.strictly
8.signals (signs)
9.prohibitive
10.warning
VI
1.used -> use
2.with-> without
3.lack -> a lack
4.on -> of
5.It -> It is
6.a cheap -> cheap
7.for -> about
8.fast -> slow
VII
1.f
2.a
3.e
4.b
5.h
6.g
7.d
8.c