The fire was ________ big that it was impossible ________ .

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________ all these books ________ to you ?

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What do you think________ ?

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All the people ________ trapped escaped ________ the fire .

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After his mother________ the alarm clock, he woke up.

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It became very hot while we ________on the top of the building.

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A．had waited

B．had been waiting

C．were waiting

D．are waiting

When a person ________,cool and wash the burnt area under the cold running water.

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Paper ________ fire easily. When it is ________ fire , you should cover it .

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A．on, caught

B．is on , caught

C．catches , on

D．is caught , on

When they ________ in the fire, each of them made a promise.

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Though it ________ me , you may use it .

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