主谓一致
　　21、The glass works in 1959.
　　A.were set up B.was set up C.were put up D.were built
　　22、Three hours with your girl friend to be a short time.
　　A.seem B.seems C.is seeming D.has seemed
　　23、It was reported that six including a boy.
　　A.was killed B.were killed C.was killing D.had killed
　　24、The police a prisoner.
　　A.is searching for B.are searching forC.is searching D.are searched for
　　25、Deer faster than dogs.
　　A.run B.runs C.are running D.will run21、B works在此句中是指工厂，所以是单数。

　　参考答案：
　　22、B
　　23、B six在这儿指的是人，因此用复数形式。
　　24、B
　　25、A deer, sheep是单、复数同形，根据后面的dogs，前面的deer应是复数(单数前应有a)。