—Maria is wanted on the telephone. Where is she? —She _________ the library. You can find her there.
Yesterday something ________ happened. We didn't know what it was.
This coat ________ be Tom's. He doesn't like the color at all.
—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.