The whole class applauded wildly at the end of the speech, ______ greatly encouraged Bob.
---Why not open the windows to let _____cool air in?---I’d rather you didn’t. ________air in out town is terribly polluted.
----Are my clothes too casual?----No. You can go ____you are.
How ___ I help them to understand when they won’t listen to me?
In summer, food will go bad if________in room temperature.
QQ,________you can chat with your friends, makes communication easy.