Sam _____ some knowledge of the computer just by watching others working on it.
He slipped and broke his leg. _________, he will have to be away from school for two or three months.
If I buy more than one, will you give me a _________ ?
He ran the 100 meters in 9.91 seconds, and I have not seen _________ this year.
The local government _________ him the prize for his bravery.
They gave a banquet(宴会) _________ the guests from Britain.