4)
1. Have you ever bought a car?
No, I haven't. But I've bought a bike.
2. Have you ever met my friend Maria?
No, I haven't. But I've met her sister.
3. Have you ever played role-playing games?
No, I haven't. But I've played puzzle games.
4. Have you ever done homework on the computer?
No, I haven't. But I've played games on the computer.
5)
1. save
2. present
3. part-time
4. charity
5. pair
6. bouquet
7. earn
8. crowd
9. greedy
10. enjoy