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II.根据汉语提示完成句子(共5小题; 每空1分,满分10分) 76. 在理论上这些课是可选的，而实际上他们是必修的。 In ______, these classes are optional, but in practice they are _______. 77. 住在海边的人也很容易对贝壳熟视无睹。 A person who lives near the ocean could easily _______ shells for _______. 78. 而离职的主管则得到大笔的退职金。 Departing directors, on the other hand, get big _______ _______. 79. 除了身体上的收益，有氧运动还有情感上的益处。 _______ _______ to the physical benefits, aerobic exercise has emotional benefits. 80. 一个住在周围都是松树地方的人有可能认为松针没什么了不起。 A person who lives in an area surrounded by pine forests may_______ _______ of pine needles. | 
