The science of computer, _____rapid progress has been made in recent years, is the most important of all science.
It was necessary to __________ the factory building as the company was doing more and more business.
Leaves are found on all kinds of trees, but they differ greatly __________ size and shape.
__________ what the six blind men said sounded! I can't help laughing!
—Doctor, it seems you like to work with animals.—Yes, I think animals should __________ as our friends.
Her parents require that she __________ TV after she finishes her homework.