— Open the window please, Mike.— ________? I didn't hear what you said.
I think English is as _______ as math.
________ a walk is good for your health.
This tall building has _______ floors. And Tony lives on the ______ floor.
My bicycle doesn’t work. I’ll ask Uncle Wang __________.
—— Would you like ________ camping with me ?—— I’d like to. But I’m busy ______ my homework.