This kind of medicine ________in a dry and cool place。
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.
---The best time Wuxi is in spring.---Yes, I think so.