题目内容
16.17.Bill lives in a tall building in the city centre.
18.It was four o'clock in the afternoon when he got into the lift in the building.
19.The lift went up quickly at first and it suddenly stopped between two floors.
20.Bill was too frightened to call for help when he was alone in the dark.
21.Bill thought the whole building was on fire when he heard the fire alarm.
22.When the lift stopped on the ground floor,a fireman was waiting for Bill outside.
23.Bill was saved because he happened to press the alarm bell.
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