1 . Always chew food well before ______ (swallow) it. If not, it will lead to indigestion (消化不良). (所给词的适当形式填空)
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2 . Look! A frog ________ ________ (swallow) by a snake over there. (所给词的适当形式填空)
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3 . In fact, the chances of anybody ________ (swallow)by a whale are rather low. (所给词的适当形式填空)
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