—Who has taken my pen away? —__________. He was here a moment ago.
—Hi , Tom , why are you looking so tired ?—I'm tried. Because I ______ the living room all day.
______ is troubling me is ______ I don’t understand ______ he said.
My parents offered me some money, ________, I couldn’t have bought that house.
You should finish this task_______ hard it is if you are to succeed.
Most smoker say that they _______ smoking to some degree, but health experts suggest that they had better _______.