Goodbye, Mr Carter---my secretary will ____ you to the door.
(2012·安徽) The limits of a person's intelligence, generally speaking, are fixed at birth, but __________ he reaches these limits will depend on his environment.
It suddenly occurred to him __________ he had left his keys in the office.
—Do you think their table tennis team will win the first place at the coming Asian Games? —__________. Ours is much stronger than theirs.
The death rate is __________ pigs and recovery usually __________ within 7—10 days.
__________ is certain is __________ prevention is more important than treatment.