We've got plenty of time. We _____hurry.
A. can't
B. couldn't
C. wouldn't
D. needn't
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He didn't answer when I called—he _____to bed.
A. would have gone
B. must have gone
C. will have gone
D. shall have gone
The earth is _____ by air, which makes up its atmosphere.
A. surround
B. surroundings
C. surrounding
D. surrounded
Everything is developing so quickly in today's world that I am afraid I can't _____ all the changes.
A. keep up with
B. wrap up with
C. pick up with
D. hold up with
Mark wanted to finish his homework in two hours, but it _____to be harder than he thought.
A. turned up
B. turned out
C. turned down
D. turned in