用适当的关系词填空。
1. Everything ______ I know will be taught to the students.
2. This is the best film ______ I have ever seen.
3. The picture ______ has a house and flowers is the one I like best.
4. The house ______ stands on the top of the hill was built last month.
5. The medicine ______ he bought is good for your health.
6. He is the only person ______ saw the accident yesterday.
7. The present ______ he gave her yesterday evening is still unopened.
8. The newspaper ______ you are reading is two days old.
9. The student ______ the teachers are talking about has won the first prize in the English contest.
10. I know the girl ______ the teacher praised yesterday.