Betty advised me to label our luggage carefully in case it gets______in transit.

单项选择题There is a ______ of impatience in the tone of his voice.

单项选择题Does the TV say ______ happened in Iraq every day

单项选择题Gun control is a subject ______ Americans have argued for a long time.

单项选择题Bats are surprisingly long-lived creatures, some ______ a life span of around 20 years.

单项选择题As a salesman, he works on a (an) ______ basis, taking 10% of everything he sells.

单项选择题I'm not quite sure how to get there. I'd better______a map.

单项选择题—I'm going to study engineering in Tsinghua University tomorrow. —______.

单项选择题______被认为是教育心理学的创始人。

单项选择题—You haven't been to Beijing, have you — ______. And how I wish to go there again!

单项选择题According to the United States Constitution, the legislative power is invested in ______.