School students ________ smoke because it is against the school rules.
A.needn’t B.couldn’t C.won’t D.mustn’t
_____ great fun it is to make a snowman in winter.
A. What B. What a C. How D. How a
The flight to London was because of the heavy snow.
A. put up B. put out
C. put off D. put away
Tom is weak in physics. He always feels _______ before he takes a physics test.
A. interested B. comfortable
C. nervous D. proud
Ann is a careful girl. She always goes over her exercises to____ there are no mistakes.
A.look for B.make sure
C.find out D.think about
To be healthy, one must have at least _____ sleep every day.
A.eight hours B.eight hour’s
C.eight-hour’s D.eight hours’