1. The books are on computer science. My brother borrowed them from the school library.
=> The books which my brother borrowed from   the school library  are on computer science.

2. The students have just received the awards from the principal. They are good at Math.
=> The students that are good at Math have just received the awards from the principal.

3. Lan admires the young man. He has just been the Nobel Prize on Physics.
=>  Lan admires the young man who  has just been the Nobel Prize on Physics.

4. They invited us to the house. They bought it last month.
=> They invited us to the house which they bought last month.

5. Do you know the boy? He borrowed that book.
=> Do you know the boy who  borrowed that book.?

6. Half of the people didn’t appear. They were invited
=>  Half of the people who were invited didn’t appear.

7. The festival is called Easter. It is in late March or early April
=> The festival which is in late March or early April is called Easter.

8. The pupil gets scholarship. He is very poor.
=> The pupil who is very poor gets scholarship.

9. She is a nurse. She took care of me.
=>  She is a nurse who took care of me