题目内容
39. The headmaster encouraged the candidates for the national math competition to __________ for the best results.
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40. It was a long __________, and Jack and I both started to get annoyed after about two hours.
41. The factory is __________ at a 60% increase in production this year.
42. Her bitter experience on the island has __________ her into a stronger person.
43. Mary is so excited because she will __________ her class to make a speech on TV.
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