---Do you know sound travels very fast?----Yes. But light travels _______ sound.
I think ______ in the old people’s home is great fun.
Our teacher expects all of us ______ happy and independent children.
—Susan, I have a sore throat.—You talked ______ just now. Please drink more water.
—Could I open the door?—______. It’s very cold outside.
I think these students should do ______ part in keeping the class-room clean.