根据句意及首字母完成单词。

1. It is i   __   for him to finish the work in such a short time.

2. Our school is beautiful with h    __   of trees around it.

3. We hope to f   __   to the moon for vacation some day.

4. There is so much p   __   in this city;people must do something to stop it．

5. There are a lot of computer c   __   in our city.