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Attention, please!Come into the room two ________ a time to be examined．

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Sunglasses protect your eyes ________ the sun and the wind．

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The Red Cross provides food and shelter ________ disaster victims．

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The Russians were the first to send a man ________ space．

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Thin as he is, he can run ________ amazing speed．

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Much research should be done ________ this project．

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________ the summer holidays, he helped his grandparents on the farm．

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Lu Ming was elected to take charge ________ our class．

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Don’t bother ________　________ the bus．You’ll never catch up with it．

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They share the similar hobby, which is ________　________ wild animals．