Computers are very useful in our lives, but they must properly.
A. use B. be using C. be used
— Beibei, is Mr. Chen in the office?
— No. He for half an hour.
A. left
B. has left
C. has been away
— What’s the time, please?
— Sorry, I have no idea. There is wrong with my watch.
A. something B. nothing C. anything
He has failed several times, he never gives up.
A. if B. so C. but
In thousands of cities and towns, lights for Earth Hour Movement on March 29 this year.
A. stayed up
B. went out
C. tried on
Zheng He, a Ming dynasty explorer, illness on his way back to China from Africa in 1433.
A. lived on
B. tried out
C. died of
