The bus picks ______ passengers outside the airport.
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水池设计主要讲究平面形式的变化，根据静水的平面变化，一般可以分为 和 。（填写答案时，需要输入逗号，勿加其他符号或空格）
His litter brother quickly ______ the screws that held the cassette together.
Your eyes can’t see the black hole because there is no light from it.
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