III.
1. The writer saw an accident.
2. The boy's leg was broken and it was bleeding badly.
3. The taxi driver was driving at the very high speed when the accident happened.
4. No, they didn't.
IV.
1. It is about 300 km from Nha Trang to Da Lat.
2. How far is it from Ha Noi to Da Nang?
3. He didn't use to go to work by motorbike.
4. My brother used to ride his bike dangerously.
5. When does traffic jam happen in the city?
Unit 7
I.
1. strictly
2. over
3. speed limit
4. How long
5. walk across
6. signal
7. road user
8. illegal
9. from
10. baby
11. rush hour
12. do
13. obey
14. look
15. catch
16. by bus
17. transport
18. within a red triangle
19. fasten
20. vehicles
