__________ there are a large number of chemical factories，the air is likely to be polluted.
| A．That | B．Where | C．Once | D．As |
---- Liu Qian has just come back from Canada and she looks very excited.
---- She ________ her trip very much.
| A．should have enjoyed | B．might enjoy | C．must enjoy | D．must have enjoyed |
The meeting started at ten o’clock, but the chairman has not _________ yet.
| A．turned up | B．turned down | C．turned out | D．turned off |
_________ impressed the visitors was _______ the trees were so tall in Vancouver.
| A．that; that | B．what; what | C．what; which | D．what; that |
__________ a terrible storm would attack the old town.
| A．Word came that | B．Word that came | C．Word came which | D．Word comes that |
After entering the meeting hall, Mike _______ a friend and went over to greet him.
| A．knew | B．searched | C．spotted | D．realized |