The girl ______ you talked with at the school gate is our new math teacher.

—Do you know the girl ______ is playing the guitar?         
—Yes, she is Jack's sister.           

—Do you know the girl _______ wears glasses?
—You don’t know? She is our new classmate.

I have bought the camera ________ was advertised (做广告) on TV.  

The village in _______ I once worked has changed a lot.   

It is the third time ________ I have been here.  

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.

My father has many books, some of _____ are on history.     

—What's the reason ______he didn't go to school last week?  
—The reason was______ he was ill.  

This is the question _____ we are talking about now.