—I’m tired out these days.--Well, you’d better keep a _____ between work and play.
I don't think the girl has a real gift_______ dancing, but she practises so hard and wants to be a dancer when she grows up. I admire her_______ her courage.
-Do you know_______ second-hand smoke? -To protect our health and memory.
It's foggy today. I'm not sure _______ the highway will be closed soon.
_______ the students_______ their teacher know about the four people.
Super Brain is_______ an interesting TV program_______ many people like watching it.