根据句意，用括号中所给单词的正确形式填空。

1. They are trying to do something  ______ (help) the old.

2. Sally prefers staying at home to ______ (go) out on Sundays.

3. How is your uncle? Please say hello to ______ (he) for me.

4. Nancy is too young to look after ______ (she). Don't leave her alone.

5. Recently the drought (干旱) is serious in the ______ (south) part of China.

6. Today most students can go to high school for further ______ (educate) in our country.

7. We're doing a lot of activities to celebrate the ______ (ninety) birthday of the Communist

     Party of China (中 * * 党) this year.