1.Is this the recorder you want to repair it 这句子若删除了it就对了,

1.Is this the recorder you want to repair it 这句子若删除了it就对了,
2.The result of the entrance exams was not made ___ to the public until last Thursday.A.knowing B.known C.to know D.to be known 这道题为什么选B 不是 be made to
3.I have often heard the"ABC Song" sung but I have never heard Alice ______ it.那个空为什么填sing而不是singing?
4.The____professor found the matter ____ 两个空分别填.surprised;surprising 好像不对啊,为什么?
5.7.He found them ____ at a table playing chess.这个空能填seated,那能不能填sat呢?