Ex1.
1. A
2. B
3. C
4. A
5. C
Ex2.
1. B
2. C
3. C
4. D
5. C
6. B
Ex3.
1. fishing, is
2. has collected, was
3. have studied
4. will have stayed
5. will be having
6. will be used
7. sitting
8. needs
Ex4.
1. No, they aren't
2. Young men have the worst accident records of all because they often choose faster cars with bigger engines.
3. Passengers have an effect on the driver.
4. When their wife or girlfriend is in the car
5. They drive more slowly and safely.
Ex5.
1. She has worked as a secretary in this factory for 5 years.
2. My French friend isn't used to driving on the left.
3. I used to take my son out for a walk every afternoon when I was young.
4. We didn't have enough money to go on holiday.
5. The sea was too rough for the children to go swiming.