—________ did you pay for the Walkman? —Two hundred yuan.
—Is Mr. Smith over there?—It ________ be him. He has gone to Beijing on business.
- was the car invented?--It was invented in 1983.
I enjoy playing computer games, but I can't spend too much time ________ that.
________ is bad for your eyes ________ TV too much.
She is ________ poor ________ buy that nice dress.