You _______ smoke .You are only 14 and it isn’t allowed.A. don’t have toB. mustn’tC. needn’t
Little Tom eats_______ food , so he is_______ fat .
_____ she is only 4 years old, ______ she can plays the piano.
_________you don’t give up(放弃),your dreams will come true.
----- Jack, is there __________ in today’s newspaper? ----- No, nothing.
It is time for class. Let’s stop _______.