Ex 1:

1. who

2. whom

3. which

4. that

5. which

6. which

7. who

8. whom

9. who

10. that

Ex 2:

1. The police officer who gave me directions was friendly.

2. The building which was destroyed in the fire has now been rebuilt.

3. I like the shirt which you wore to class yesterday.

4. A bomb which went off this morning caused a lot of damage.

5. I didn't know the man who walked into my office.

6. The soup which I had for lunch was too salty.

7. The girl who was injured in the accident is now in hospital.

8. The bus which goes to the airport runs every hour.

9. The footballer who took drugs has been banned from playing again.

10. The people whom we are visiting next week live in Bristol.

11. I live next door to the woman who works in your office.

12. Where are the pictures which were on this wall?

13. My father is the person who has great influence on my behavior.

14. Do you like the flowers which I bought this morning?

15. All of us are interested in the man who is teaching us P.E.