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.
