Europe has achieved more in controlling the AIDS virus than Asia in the past ten years, _________ the number of people infected with the virus is going up sharply.
He doesn't know_________ the work by himself.
Oh, boy, why are you killing your time this way? Can’t you find something ________ doing?
—Which of the two pens are you going to buy? —I’ll buy _____of them, so I can give one to my friend.
You made the same mistake forthird time, dropping_____“u” in the word “unusual”.
--Hi, is Mary there, please? ---