Ответ:

1. What are you doing here? I'm waiting for a friend.

2. Does he speak French? Yes, he speaks French well.

3. Someone is knocking at the door.

4. The students are writing a dictation there.

5. The man who is reading a book is our English teacher.

6. Let's go for a walk. It isn't raining.

7. He is looking for his key.

8. He is doing his homework.

8. We usually watch TV One but tonight we are watching TV Two for a change.

10. Sam is playing ball.