根据句子意思，用所给单词的适当形式填空。

1. How           watermelons do we need? (much)

2. We still need ten            . (orange)

3. Would you cut up some              for me? (tomato)

4. Ten minutes for you to make your favorite           . (sandwich)

5. Our teachers are              to us. (friend)

6. What would you like ___________ (drink), tea or coffee?

7. Why ______ you ______ (not stay) at home? It's so cold outside.

8. Are you _________ (good) than Jim at speaking English?

9. Thanks for __________ (have) us to your party.

10. _________ (not drink) too much milk when you are hungry.

青蒿素是我国学者子黄花蒿中分离出的具有强效抗疟作用的药物，其分子中的（）是必要的药效团。