【2012·湖北·荆州】— Do you know sound travels very fast? — Yes. But light travels sound.
-- Could I clean the room for you ? --- No, thank you. I ________it myself.
Mr. Yang teaches ______math and is very strict with us.
He has few friends and often feels lonely , _______he has much money.
I will go to Hangzhou sometime next week. Perhaps I _____visit you at that time.
In class , our teachers always stand______ us in order to hear us clearly.