I think simple things like bike ________ can help to keep healthy.
A. ride B. riding
C. to ride D. rode
Not only ________ dance well, but he sings very well.
A. he does B. does he
C. does D. he
We should stop ________ trees at will (随意)．
A. cutting off B. cutting down
C. cutting down on D. cutting up
This blue shirt ________ him 20 dollars.
A. cost B. spend C. take D. pay
I watched TV________ doing my homework last Sunday.
A. instead B. instead of
C. but D. and
He would like to ________the next Cleanup Day.
A. play with B. play to
C. play against D. play a part in
