We must plant more trees after we _____ every year.
A. cut off them B. cut them off
C. cut down them D. cut them down
The supermarket provides customers _____ plastic bags for free.
A. on B. with C. of D. in
I think it’s good _____ us _____ eat healthy food.
A. for; to B. for; for C. to; for D. to; to
——We really shouldn’t use plastic bags any more when shopping.
——_____ It’s important to protect our environment.
A. So do I. B. With pleasure.
C. That’s OK. D. So it is.
Our country _____great progress in science and culture in recent years.
A. makes B. has made C. made D. make
The earth _____ around the sun.
A. moves B. moved C. has moved D. was moving
