--- English is _________ so difficult to me. I can’t learn it well.--- Don’t give up(放弃).
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.