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I saw Ken in the meeting room, he ______ Joe for the school magazine.

—Hurry up! The concert         for ten minutes.
—OK. I’m coming.
A. has begun            B. has been on          C. has put on.

— Jim, get up！It's already 9：00 in the morning．
— Really? I ________ too much．

----- Why is Mr . Yang still in the teachers’office ?
---- Maybe he _______ his work yet .

— A computer is very popular and helpful .
— I think so. It _______ in many different fields.

— I called you yesterday evening, but no one answered.
— I ______in my bedroom at that time.
A. read        B. was reading     C. am reading

—Why didn’t you answer my phone call, Jack?
—I’m sorry, but I ________ then.

--Mike, can you tell us something about our new teacher?
-- Oh, sorry. I know nothing because I _____________ him before.