Sure! Here are the completed sentences using relative pronouns:

### Exercise 2:
1. A café is a small restaurant **that** people can get a light meal.
2. Alaska, **where** my brother lives, is the largest state in the US.
3. This is the house **where** we often stay in the summer.
4. Do you remember the clock tower **where** I first met you?
5. Tell me the reason **why** you were absent yesterday.
6. There was a time **when** dinosaurs dominated the earth.
7. The house in **which** I was born and grew up was destroyed in an earthquake ten years ago.
8. Summer is the time of the year **when** the weather is the hottest.
9. The reason **that** Jim has just lost his job is that he didn’t work hard enough.
10. They hid the money in a place **where** it was safe from robbers.

### Exercise 3:
1. Have you got the money **that** I lent you yesterday?
2. Peter, **whom** I had seen earlier, wasn’t at the party.
3. This is the machine **that** cost half a million pounds.
4. Mary, **who** had been listening to the conversation, looked angry.
5. Have you read the book **that** I gave you?
6. The house, **which** they bought three months ago, looks lovely.
7. Mrs. Jackson, **who** had been very ill, died yesterday.