A、onceB、oneC、aI try to go swimming at least () a week.t……

单项选择题Sarah () a really nice flat in Brighton.

单项选择题Do you ()your father?

单项选择题Can () you come to the meeting?

单项选择题She has() a domestic helper to do the housework.

单项选择题He has () to England.

单项选择题Tom has worked in this post()two years.

单项选择题Tom is from Houston.

单项选择题（文）Dear Professor Liu, Please accept my greeting from New York. (尊敬的刘教授，请接受我来自纽约的问候。)I am just beginning my graduate (研究院) studies here at this university. It is the third week of classes now. My roommate, Tom, is also. How are you getting on? Are you still working on your paper now? Please say 'Hello' to those who have taught me I miss all of you very much Love Wang Hui Wang Hui is writing to her former teacher.

单项选择题His performance did not live up to our expectations.

单项选择题When your heart is in your dream, no request is too extreme.

单项选择题Grapes are usually either green or red.

单项选择题The city government has convinced the public that the housing problem will soon be solved.

单项选择题Whatever she did, it made no difference.

单项选择题People who boiled their water to take with tea tended to catch fewer diseases than those who danrk it cold.

单项选择题After Mr. Smith retired, his son took over his company.