1. I (need/have to) have my hair cut before the party.
2. I am not fit-I (must/have to) take some exercise.
3. When I was a child I (walk) six kilometers to school.
4. Why is your hair wet? I (swim) in the river.
5. If you (mix) blue and yellow paint, you (get) green paint.
6. If I (be) you, I (talk) to the teacher.
7. I just (arrive) home, when the phone (start) to ring.
8. The environment (improve) as people (use) trains more.
9. Here is a book (which/where) describes this crime.
10. While I (wait) outside the disco for a friend, I (meet) my cousin with her boyfriend who just
(come) back from France.