世界上的树______,有的像白杨一样______,有的像垂柳一样飘逸,有的像油松一样坚韧。
— What would you like to have, meat or fish?
— _____________________.
— ___________________
— Once or twice a week.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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