主谓一致
　　16、Laying eggs the ant queen’s full-time job.
　　A.is B.are C.has D.have
　　17、Between the two buildings a monument.
　　A.stand B.stands C.standing D.is standing
　　18、I, who your good friend, will share your joys and sorrow.
　　A.am B.is C.are D.was
　　19、The United Nations in 1945.
　　A.were found B.were founded C.was founded D.was found
　　20、 were also invited to the party.
　　A.Mr Smith B.The Smith C.The Smiths D.Smiths

　　参考答案：
　　16、A ，动名词作主语。
　　17、B 倒装，见讲解3。 18、A 。 19、C
　　20、C 因谓语动词是复数，所主语应是复，The Smiths是指史密斯一家人。