开采以后底板岩层中可以分成 ______ 、 ______ 、 ______ 和 ______ 。
— What would you like to have, meat or fish?
— _____________________.
You can _____ some bottles of wine, or some chocolates, or a bunch of flowers.
— ___________________
— 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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