1. The number of people invited ______ (be)fifty, but a number of them _______ (be)absent for different reasons.
【答案】was; were
【解析】考查主谓一致。第一个空前的“The number of people invited 被邀请的人数”做主语,谓语动词用单数;第二空前的“a number of them他们中的很多人”做主语,谓语动词用复数。又根据句意“被邀请的人数是50,但是其中很多人都因为不同原因而缺席”可知这两个空都用一般过去时,故填was;were。
2. E-mail, as well as telephones, ________ (play)an important part in daily communication.
【答案】is playing
【解析】考查主谓一致。as well as 连接两个名词做主语,谓语动词应该与前面的名词保持一致,故填is playing。句意:电子邮件和电话一样,在日常交流中扮演着重要的角色.