All passengers on board are expected (fasten) the seat belts when the plane takes off and lands.

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1. All passengers on board are expected (fasten) the seat belts when the plane takes off and lands.

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使用过本题的试卷

人教版（新课程标准）2018-2019学年高中英语必修五Unit 3 Life in the future 训练卷（一）