根据所给词的适当形式填空。

1. It is the home page of one of the ______ (survive).

2. What city is Mrs Johns leaving for ______ her daughter tomorrow? (see)

3. The two girls ______ (trap) in the burning building.

4. He looked ______ (sad) at the broken toy car.

5. Can you hear the loud noise ______ (follow) lightning?

6. I ______ on the ice when you called me. (skate)

7. At the beginning of the ______ (twenty) century, the world's population was 1.7 billion.

8. I hope you _______ (not forget) to lock the door next time.

9. Bad weather sometimes causes _______ disasters. (nature)

10. Nobody but Mary and her sister _______ (know) where he is from.