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选用下列短语的适当形式填空。
think about think over work out work on have been to have been in
hear of hear from used to be used to look for find out
1. I _______________ going to Beijing for my holiday.
2. I _____________ play football when I was younger, but not very often.
3. The scientists _________ inventing new ways of reaching outer space.
4. We _______________ the Great Wall twice already.
5. There is an important matter _______________.
6. --- __________ you _________ Mr Black, sir? --- Yes, we often write to each other.
7. --- Can you _______________when the train will leave for Shanghai? --- Of course.
8. We _______________ the cost of the holiday and decided that we could afford it.
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