1.About 60 percent of the students _____ from the south,the rest of them _____ from the north and foreign countries.
A.are/is B.are/are　C.is/are D.are
　2.Half of the workers here _____ under 30 _____.
A.is/years B.are/year old C.is/years old D.are/years of age
　3.Now Tom with his classmates _____ football on the playground.
A.play B.are playing　C.plays D.is playing
　4.The number of pages in this dictionary _____ about two thousand.
A.are B.has　C.have D.is
　5.Thirty dollars _____ too expensive.
A.are B.is C.were D.be
　6.The audience _____ so large that no seat was left unoccupied in the great hall.
A.is B.are C.was D.has