I think drinking milk every morning is good __ our health. --Yes. I agree ___ you.
--- Doctor, ________ should I take this medicine? --- Twice a day.
The Math problem is too difficult , we really don’t know ________ to do it .
---What do you think of ______Bai Yansong? ---He is _______ good host(主持人)that I like his program very much .
---Excuse me. Is the library open all day? ---. Only from 8 a.m. to 4 p.m.
You afraid of doing homework. You know, it’s easy. Just be careful.