用所给单词的适当形式填空。
1. We need to produce a lot of _ (medical) to save those people who get HINI flu.
2. More and more parents are _ _ (worry) about their children playing computer games.
3. As a student, you should learn more _ (know) from your teachers.
4. All the land was _ (cover) by the white snow when we got up last Sunday.
5. I think playing computer games is not _ (help) to your study.
