___ were sitting at the breakfast table when I knocked at the door.A. Green B. Greens C. The Greens D. The GreenThe English teacher and headmaster_with the students.A.is talking B.are talking C.talk D.were talkingHalf of the money_your brother.A.belong to B.belong C.is belonged to D.belongs toA number of their products_put on exhibition.A.has been B.is C.have been D.areIn that country,the rich_richer,the poor,poorer.A.become B.has become C.becomes D.is becomingWho did the work_unknown.A.has B.is C.have D.are