1. The children are very quiet. Go and see what they ____________________________ (do).
2. It ____________________________ (be) very cold this year. I wonder when it is going to get warmer.
3. Cuckoos ____________________________ (not build) nests. They use the nests of other birds.
4. Shakespeare ____________________________ (write) a lot of plays.
5. If he worked more slowly he ____________________________ (not make) so many mistakes.
6. I ____________________________ (wait) for you when you come out.
7. The airplane in which the football team ____________________________ (travel) crashed soon after taking off.
8. If you think it over you ____________________________ (see) that I am right.
9. Rome ____________________________ (be captured) by her enemies if the geese hadn’t cackled.
10. When I ____________________________ (be) here for a year I’ll ask for a rise.