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1. Peter asked Mary if he could borrow her some money , he wanted to buy that shirt.
2. Unless we had much money, we couldn't have a holiday abroad.
3. The man whose opinions I always respect is my father.
4. How long is it since you saw him?
5. She has seen me for two months.
6. What is the length of this river?
7. Used plastic things are recycled to save natural resources.
8. If there weren't water, we couldn't live.
9. Unless you work harder, you won't succeed in the examination.
10. Do you mind not making noise in my office?
11. It is such an expensive car that I can't buy it.
12. Columbus, who was a great explorer, discovered America.