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 —I called you at 4:00 yesterday afternoon, but no one answered.

—Sorry, I _____ with my friends at that time.

A. swim B. swam C. will swim        D, was swimming

—I'd like to introduce my best friend to you, Peter.

—Thank you, Lucy. But we _________already.

A. meet B. met C. will meet　　　 D. have met

 —Have you heard of Earth Day?

—Yes. The first Earth Day _________ in 1970 to educate us to protect our planet.

A. celebrates .     B. celebrated     C. is celebrated   D. was celebrated

 —What smells terrible, Ted?

—I'm sorry. I'll _______ my shoes and wash them at once.

A. take away B. put away C. move away D. get away

－Have you ever been to Shanghai?

－Yes. I ______ there with my father last year.

       A. went                                 B. have been                           C. have gone

 If more trees ______ planted, our city will be more beautiful.

       A. were                                 B. are                                    C. will be

—When did you buy the computer?

—I have ______ this computer for 5 years, but it still works well.

A. bought　　　　　　　　　　　　 B. have　　　　　　　　　　　　 C. had

 —I called you last night, but you didn’t answer it.

—I’m terribly sorry. I ______ a meeting at that time.

A. had                             B. was having               C. am having

 He ______ go out with his parents, but now he ______ staying at home alone.

A. used to； is used to     B. is used to； used to  C. use to； is used to

 You should ______ it carefully before ______ a composition.

A. consider； write                 B. consider； writing           C. considering； writing