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21. We have got plenty of time. We ______ hurry.
A. needn’t B. mustn’t C. shouldn’t D. cannot
22. Our teacher asked us to give all the used books to ______ needed them.
A. all B. whom C. those D. those who
23. Was it because his mother was ill ______ he didn’t go to school?
A. so B. that C. why D. when
A. needn’t B. mustn’t C. shouldn’t D. cannot
22. Our teacher asked us to give all the used books to ______ needed them.
A. all B. whom C. those D. those who
23. Was it because his mother was ill ______ he didn’t go to school?
A. so B. that C. why D. when
