Who ______ the fight against the H1N1 flu ______ it not been for the Chinese scientists’ great efforts?
He hasn't slept at all for three days. __________ he is tired out.
Good technique in medicine means less pain and fewer deaths and, __________ it is our duty to masterit.
I can lend you my textbook __________ you must return it to me before class.
Although a teenager, Fred could resist __________ what to do and what not to do.
Even though the Smiths have moved to a faraway place, we still see them __________.