[单项选择]A. Put out the fire. B. Stop talking. C. Put up a notice. D. Stop smoking.

[填空题]Why can water put out a fire

[填空题]What can’t be used to put out gasoline fires

[单项选择]---Sir,could you please put out your cigarette This is a smoke--free(无烟的)school. ---（ ）
A. had know
B. know
C. have known
D. knew

[单项选择]A. He helped put out the fire.
B. He wrote about the fire.
C. He happened to see the fire.
D. He was rescued from the fire.

[填空题]

[听力原文] 11-15
At last firemen have put out a big forest fire in California. Since then, they have been trying to find out how the fire began. Forest fires are often caused by broken glass or cigarette ends which people carelessly throw away. Yesterday the firemen examined the ground carefully, but were not able to find any broken glass. They were also quite sure that a cigarette end did not start the fire. This morning, however, a fireman accidentally discovered the cause. He noticed the remains of a snake Which was wound round the electric wires of a 16,000-volt power. In this way, he was able to solve the mystery. The explanation was simple but very unusual. A bird had snatched up the snake from the ground and then dropped it on to the wires. The snake then wound itself round the wires. When it did so, it sent sparks down to the ground and these immediately started a fire.

What often caused the forest fire
Forest fires are often caused by broken glass or（）

[填空题]No sooner ______ (我刚点着蜡烛) than it was put out.

[填空题]Ethylene gas is put out by means of_______________.

[填空题]The fire ______ (put) out already before the Bremen arrived.

[填空题]The fire ______ (put) out already before the firemen arrived.