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C. Finish the second sentence in such a way that it means exactly the same as the first one:
1. They bought this house ten years ago.
They have …………………………………………………………………………………………
2. When did you first know him?
How ………………………………………………………………………………………………..
3. Their trip lasted three day.
They had …………………………………………………………………………………………...
4. She had to do the washing up but she didn't.
She forgot ………………………………………………………………………………………….
5. If you don't rest yourself you really will be ill
Unless ……………………………………………………………………………………………..
6. Their teacher is making them study hard.
They ………………………………………………………………………………………………..
7. It is necessary to finish the work today.
You need …………………………………………………………………………………………..
8. I advise you to take a holiday
You'd ………………………………………………………………………………………………
9. Since the invention of computer, people have saved a lot of time.
Since the computer was ……………………………………………………………………………
10. Don't leave the lights on all night, you will waste electricity.
If ……………………………………………………………………………………………………
1 don't they
2 aren't we
3 wasn't it
4 didn't he
5 haven't they
6 hadn't he
7 won't she
8 won't they
9 won't she
10 mustn't he