1. Who (stop) you?

2. The fog (begin) to lift.

3. It (rain) now.

4. They (listen) to pop music.

5. I (write) a difficult letter.

6. I (sit) in the chair.

7. Google (offer) a new service.

8. He (eat) dinner.

9. She (open) the window.

10. I can't imagine what she (refer) to.