题目内容
As the airplane was getting ready for taking off, we are asked to ________ our seat belts.
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She ________ for the little boy when she saw him playing with fire.
Generally we hand in tuition ________ at the beginning of the term.
Please ________ in this form, giving your name, sex, age and telephone number.
The students ________ their papers by the end of this month.
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