用所给词的适当形式完成句子 .

1. It is said that it becomes the longest day when the       _ (summer) comes.

2. They often help us to hold some         _ (organize) games after school.

3. My brother wants to be a       (history) so he studies history in the university.

4. The old man often        _ (pray) the god to give him some money.

5. All the _       (enemy) had run away when we got there.