1.Some of the scientists held the point___the book said was right.
2.The reason_his being late is____he didn’ t catch the early bus.
3 .____does he play chess well____he plays the piano well.
A.Not only, but also
4.Now we have begun to use a new communication system,____4G as we call?
5.I didn’ t hear the phone I______asleep.
C.must have been
D.should have been