It is _______ for people to feel excited when they start doing something new.

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It is requested that rent for the house _______ in advance.

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单选题

_______ is defined as the actual speed of the airplane over the ground. It is true speed adjusted for wind.

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单选题

It‘s bad _______ for a man to smoke in the public places where smoking is not allowed.

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单选题

Code 7700 is used for _______ ．

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单选题

Mr.Hall understands that_____math is easy for him, it is not easy for the students. (2.0)

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