– How fast when the police stopped you? -- I don’t know exactly, but not too fast, I think. A. were you driving B. did you drive C. are you driving
The supermarket provides customers _____ plastic bags for free.
I think it’s good _____ us _____ eat healthy food.
——We really shouldn’t use plastic bags any more when shopping. ——_____ It’s important to protect our environment.
Our country _____great progress in science and culture in recent years.
The earth _____ around the sun.