Choose the best expression for each blank from the list of choices given in the box. （注意变形，第6小题注意用上...）
1. China successfully ____________ a man-made satellite in 1970, which was a breakthrough in Chinese aviation history.
2. Many college students who have ________________ English for more than ten years can’t speak fluently in English.
3. ____________ tribes lived by fishing, hunting and gathering, and they hunted wild animals with crude stone implements.
4. He ____________________ the anti-nuclear movement after the nuclear leak accident.
5. Cycling is the use of bicycles for transport, recreation, or for sports. People engaged in cycling are
referred to as“____________”.
6. Barter trade prevailed at the time of famine. One can ___________ a loaf of bread ___________ a coat.
7. This conference aims to tackle the problems and ____________ strategies to help nations adapt to
climate change.
8. More often than not, teenagers who ____________ school have trouble in finding high-salary jobs.
9. Buddy Holly was killed in a plane ____________ while on a singing tour in the Midwest.
10. These days, if a job is available, young people often have to ____________ more experienced workers.
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