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’
