单项选择题

How did people begin to use a fire（）

A．We know how people began to use fire.
B．Nobody knows how to make a fire.
C．It was an Australian who started a fire.
D．We are not sure how people started a fir

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单项选择题

Children mustn't play with matches because（）

A．matches burn paper
B．it isn't interesting
C．they can be dangerous
D．they can burn a house

单项选择题

The doctor was very sorry because （）

A．he didn't cure the lawyer's wife
B．the lawyer's wife was badly iii
C．he killed the lawyer's wife
D．the lawyer paid nothing for his work