These children are polite and never speak loudly in class._____.
The secretary and principal __________ at the meeting now.
We all think Mr. Smith __________ a new house if more new houses __________.
If better use is __________ of your spare time, you'll make great progress in your study.
English is difficult __________ well in a short time.
Paul doesn't have to be made __________. He always works hard.