—Did Tom’s parents go to the meeting yesterday?—Yes, of them did, but spoke.
—I often have hamburgers for lunch.—You'd better not. It's bad for you ________too much junk food.
The new treatments ________by Norman Bethune helped a number of soldiers.
If prices rise too high, the government has to do something ________it.
At last the boy was made ________and began to laugh.
—Don't forget ________your homework,John. —OK.I'll do right now. A.doing B.do C.to do