. The buses, most of _______ were already full, were surrounded by an angry crowd.
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.
The careless driver is __________ for the traffic accident that __________ yesterday.