—Do you know when the 29th Olympic Games ______? —Yes, in 2008.A. hold B. is held C. was held
— When did the meeting begin?—At four o’clock.It ______ for 15 minutes.
It is said that the gravity on Mars is only about __________ of the gravity on earth.
After a short time, the bad news had ______all over the city and everybody knew it.
The workers recycle the old newspapers ______use them.
I sent ______ e-mail to Amy to say thanks for her help with my study.