Some new oilfields ________ since 1976.
A. were opened up B. will be opened up
C. have opened up D. have been opened up
She’s having a lot of trouble with the new computer, but she doesn’t know whom to ________.
A. turn to B. turn off
C. turn on D. turn up
________ you’ve heard the song, you’ll never forget it.
A. At once B. Once more
C. Once upon a time D. Once
The mother asked the boy ________ football in the street. It was dangerous.
A. to play B. playing
C. not to play D. not playing
—I’m going to the States.
—How long ________ you ________ there?
A. were; stayed B. are; staying
C. have; stayed D. did; stay
Can we ________ the internet when we study?
A. make use of B. make fun of
C. make room for D. make a decision for
