21. Most children with healthy appetites are ready to eat almost anything that is offered and a child rarely dislikes food __________ it is badly cooked．
A．if B．until C．that D．unless
22. Mary is in bed with a fever and she can’t hope to __________ the cold in a few days.
A. get rid of B. get away with
C. get off D. get out
23. He requires that he _______ an opportunity to explain his case.
A. is given B. should give C. give D. be given
24. The door and the windows were all closed and there was no ___________ of forced entry.
A．scene B．signal C．sign D．sight
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