Water, which seems to be so simple and common, is ______ makes life possible.
A．that B．which C．what D．where
William Shakespeare occupied a ______ position in English literature.
A．most unique B．unique C．very unique D．least unique
We have been told that under no circumstances ______ the telephone in the office for personal affairs.
A．may we use B．we may use C．we use D．do we use
—Tom is so worried about the test that he said he was going to study all night.
—Tell him he should quit ______ and get some help.
A．to have worried B．to worry C．worrying D．from worrying
John didn’t feel well yesterday; otherwise he ______ to see his friend off at the airport.
A．came B．would come C．would have come D．should be coming
_____ you are familiar with the author’s ideas, try reading all the sections as quickly as you possibly can.
A．Now that B．Ever since C．So that D．As long as
