The first use of atomic weapons was in 1945. and their power _____ increased enormously ever since.
| A．is | B．was | C．has been | D．had been |
Johnson knows much about the movie, I think that he must have seen it,________?
| A．doesn’t he | B．hasn’t he | C．don’t I | D．didn’t he |
It was dark. We decided to___________for the night at a farm house.
| A．put away | B．put down | C．put up | D．put on |
. I have taught hundreds of students,___________ having been working in their fields for years.
| A．some of whom | B．some of them | C．most of whom | D．who |
______, he still cannot make himself understood.
| A．So clearly he speaks English | B．So clearly does he speak English |
| C．Clearly as he speaks English | D．As he speaks English clearly |
_________ is unknown to us all.
| A．Where did he get it | B．Where he got it | C．That where he got | D．Which he got it |