`Ex9`

1. Road safety.

2. Safety helmet.

3. Railway station.

4. Traffic jams.

5. Zebra crossing. 

6. Road user.

7. Driving license.

8. Speed limit.

9. Means of transport.

10. Train tickets. 

`Ex1:`

1. I used to live in Paris, but now i live in Rome.

2. He used to have a lot of money, but now he doesn't.

3. Peter used to play guitar 2 years ago, but now he plays violin.

4. I used to eat sweets when i was a boy.

5. Sarah used to bit her nails whan she was a child.

6. There used to be some trees here but now there aren't.

7. We used to get into the habit of swimming everyday before breakfast.

8. He used to go to the cinema regularly, but now he doesn't.

9. Her custom used to get up early and have a bath every morning.

10. It used to be his custom to get up early.

`Ex2:`

1. Mr and Mrs Smith are travelling to Ha Noi by plane now

2. Van used to have a motorbike , but he doesn't any more

3. My father usually drive a car to work

4. This part of the city didn't use to have traffic jams very often

5. I used to go to school on foot when I was young

`Ex3:`

1. Traffic jam is one of the most common issues in big cities in the world 

2. There are many people using roads and it is one of main reasons cause traffic jam 

3. We can solve this traffic problem by encouraging people to use bicycles rather than cars in short trip 

4. People should use public transports to reduce the number of private vehicles on the road

5. Moving big companies and factories from the city to the countryside will help reduce the traffic jam 

=>
Ex9/
1. road safety
2. safety helmet
3. railway station
4. traffic jams
5. zebra crossing
6. road user
7. driving license
8. speed limit
9. means of transport
10. train tickets

C/
1. Last year I used to live in Paris, but now I live in Rome.
2. He used to have a lot of money, but now he doesn't.
3. Peter used to play the guitar two years ago. Now he plays the violin.
5. When I was a boy, I used to eat sweets.
6. When Sarah was a child, she used to bite her nails.
7. We used to swim every day before breakfast. 
8. There used to be some trees here, but now there aren't any.
9. She used to get up early and have a bath every morning.
10. He used to get up early.

Ex2/
1. Mr. and Mrs.Smith are travelling to Ha Noi by plane now.
2. Van used to have a motorbike, but he doesn't any more.
4. This part of city didn't use to have traffic jams.
5. I used to go to school on foot when I was young.

Ex3/
1. Traffic jam is one of the most common issues in big cities in the world.
2. There are many people using roads, which is one of the main reasons causes traffic jams.
3. We can solve this traffic problem by encouraging people to use bicycles rather than cars for short trips.
4. People should use public transports to reduce the number of private vehicles on the road.
5. Moving big companies and factories from the city to the countryside will help reduce traffic jams.

Ex4/
0. I used to play the violin, but I play the guitar now.
1. I used to go shopping once a week, but I hardly ever go shopping now.
2. I didn't use to like apples, but I eat a lot of apples now.
3. I didn't use to like tea, but I like it now.
4. I used to work in a restaurant, but I work in a hotel now.
5. I used to read the newspaper, but I read books often now.