I try to go swimming at least () a week.
time

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.