Ex1: complete the following sentences, using a suitable preposition for each gap:

1. There are many people who seem to be incapable________making friends.

2. Knowledge can help to brighten________your future.

3. Selfish people are concerned only________their own interests and feelings.

4. I always think_________my son.

5. Friendship is a two-sided affair , it lives_______give-and-take.

6. He takes_______an English course to improve his English.

7. They seem to be tired______doing the same things every day.

8. All soldiers must loyal______his country.

9. Those who are easily influenced_______rumours can never be good friends.

10. Those people seem to have no sympathy_______his abject condition.

11. Good friendship should be based________mutual understanding.

12. He insisted_______paying for the meal.