—The research on the new flu virus vaccine is challenging and demanding. Who do you think can do the job? —______ my students have a try?
I don’t think that your speech _____to the crowd, for they appeared quite puzzled.
Christmas is _____special holiday when _____whole family are supposed to get together.
—He must be in the reading-room now. We will find him there. ---No, he _____.Tom said he was ill at home .
___ some teenagers don’t realize is ___ difficult life can be after they get addicted to drugs.
Among Asimov’s most famous works of science fiction, one ______he won an award, was the Foundation Trilogy.