Everyone should play a part __ __ the earth.
A. to save B. saved C. in saving
Look, Mary! There are __ __ sheep on the farm.
A. three hundreds B. hundreds of C. three hundred of
（题文）Dale，come on! There are two people __ __ for us outside.
A. wait B. waiting C. to wait
__ __ is impossible __ __ us to finish the work by the weekend.
A. This, for B. That, for C. It, for
Please pass me two __ __ .
A. pieces of paper B. pieces of papers C. pieces paper
If there are __ __ people driving, there will be _____ pollution.
A. less, less B. fewer, fewer C. fewer, less
