问题详情：
46. The teachers are strict ________ their pupils.
47. We think _________ necessary to master a foreign language.
48. There are times __________ we need quiet and peace.
49. Beijing was the first city in China __________(hold) the Olympic Games.
50. How much ________ (popular) you look with this pair of sunglasses!
【回答】
with 47. it 48. when 49. to hold 50. more popular
知识点：语法填空
题型：完型填空
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