I. 

1. Now, there are psychologists who/that help technophobes use technology.

3. Some people dream of a job which/that they can do without technology.

4. The stereo which/that worked yesterday doesn't work today.

8. We have lost her phone number, which makes it difficult to contact her.

II.

1. The contract has just been signed by the manager.

2. My brother has never been beaten at tennis.

3. He has been invited to lunch.

7. The bank near our house has been robbed.

III.

1. Hellen used to go to the church.

2. She used to play tennis with her colleagues on Sundays.

3. I didn't use to like football. 

V. 

1. Magarret has been interested in reading since last year.
2. He hasn't taken part in the meeting for two months.

3. This is the first time they have ever met a famous person.

1. Some biscuits have been prepared for the guests by May and Peter.

2. The young boy who has just left the shop stole a pen.

3. They used to go to Vung Tau at the weekend.

4. They haven't understood the lesson yet.

5. He failed the examination, which made his father angry.

6. I can't the prints which/that this customer ordered.

8. She has been permitted to go out with her friends by her parents.

9. I used to catch fish at weekends when I was a child.

10. He has written the novel since August.