1.Either you or one of your close friends_________ to join in the exciting party tomorrow.
A. is 
B. are C. have D. would
【答案及总结】 A
句中either … or …或者……或者……连接两个主语，谓语动词用就近原则。故谓语动词用单数。句意：要么你，或者你亲密朋友中的一个参加明天的派对。
2.The university estimates that living expenses for international students _________ around $8,450 per year, which _________ a burden for some of them.
A. are; is B. is; are
C. is; is D. are; are
【答案及总结】 A
考查主谓一致。句意：高校评估对于国际学生一年的生活花费大约8,450美元，对于一些人来说是有负担的。第一句话的主语是 living expenses为复数，所以谓语动词用复数形式，第二句话主语是主句陈述的内容，所以谓语动词应用单数，故选A。
