题目内容
Listen! Can you hear the opera________ somewhere near here?
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At present, there are thousands of people ________around the clock to fight against the flood.
It is so wet there that the trees are extremely tall, some ________ over 90 meters.
The park is always full of people, ______ themselves in the sunshine.
A small plane crashed into a hillside five miles east of the city, _______ all four people on board.
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