Here are the verbs in brackets put into the correct form:

1. I will return you the book when I **finish** reading it.
2. I've decided **to stop** smoking.
3. Some people are used **to riding** in crowded buses, and don't mind it at all.
4. The gate **locks** at 6.30 p.m. every day.
5. Since my father **buys** a car, he does not walk to work.
6. It’s no use **advising** him to stop smoking.
7. It is fun to camp in the forest, but it is very important to know how **to keep** nature clean before we leave.
8. Water **covers** most of the Earth's surface.
9. I enjoy **teaching**, but I don't want **to do** it all my life.
10. **Have you done** the homework yet?