1. She bought the car which her father had recommnded.
2. He lost the pen which I have given to him.
3. We called the delivery company which Nga often uses.
4. Lam met girl whom I used to employ.
5. Chi called the lawyer whom my mother knows.
6. He brought a woman whom I worked with last year.
7. We employed the pianist whom Hai introduced.
9. The cake which I bought is on the table.