It is __________ for us to do exercises regularly. It is good for our health.
A. tiring B. necessary C. the worst
If we want to do well in the exam, we must practice________ we can.
A. as many as B. as much asC. much more than
Who is the boy________ you talked to just now?
A. which B. whoC. that
The doctor fixed some of the old woman’s _______.
A. tooth B. toothsC. teeth
Since last term, everyone except the twins_________ a dictionary.
A. hadB. has hadC. have had
Don’t forget________ “Thank you”, when others have helped you.
A. to say B. to speak C. to tell