21. Many girls can’t go to school in remote areas because their families are______ and can’t afford their schooling.
A. in danger B. in need C. in despair D. in place
【解析】选B。考查介词短语的辨析。句意为：很多偏远地区的女孩无法上学，因为她们的家庭很贫穷，无法支付她们的学费。in danger处境危险的；in despair绝望的；in place在合适的位置；in need需要的，短缺的，符合句意。
22. Would you please make up a topic worth______ in tomorrow’s conference?
A. discussing B. to be discussed
C. to discussed D. being discussed
【解析】选A。worth为形容词作后置定语修饰a topic, 句子可变为“. . . a topic which is worth discussing in. . . ”。worth后接动名词的主动形式表被动。
