题目内容
36. We require a completely new transportation energy system to ensure __________ development.
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37. Sagan may have had his elbow out by __________ as he was trying to balance himself after being hit.
38. Britain's health experts are pushing for a(n) __________ on all cigarette advertising.
39. The headmaster encouraged the candidates for the national math competition to __________ for the best results.
40. It was a long __________, and Jack and I both started to get annoyed after about two hours.
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