根据首字母或汉语提示写出单词。

1. We should learn how to p _____ a disease rather than learn how to cure a disease.

2. Our class will have a _____ on how to protect our environment next week.

3. I _____  (猜想) it's too late to catch the early bus now.

4. That poor young man died in the hospital yesterday after a serious _____  (病).

5. Miss Yang is a Doctor of _____  (医学).