题目内容

-- Why hasn't Tony come?-- But the invitation letter _____ to him.

A. was emailed
B. has emailed
C. is emailed
D. emailed

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-- Can Mr. King spare some time for the meeting?-- If he ________, he will try his best to make it.

A. will be invited
B. is invited
C. invites
D. invited

It's not your turn yet. Please wait on the chair over there until you ______ .

A. are calling
B. have called
C. are called
D. have calling

-- These days, teenagers often have to do what they _____ to.-- It's not good for their independence. They need to think on their own.

A. tell
B. are telling
C. are told
D. told

食物特殊动力作用（食物热效应）是由于（）产生的。

A. 咀嚼动作引起咀嚼肌运动产热。
B. 食物本身所具有的热度和温度。
C. 摄食吞咽动作产生的。
D. 机体由于摄取食物而引起体内能量消耗增加的现象。