while in bed,we must not cover our__,because our lungs need to get enough fresh air.A.body B.headsC.legs

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• while in bed,we must not cover our__,because our lungs need to get enough fresh air.A.body B.headsC.legs
• while in bed,we must not cover our__,because our lungs need to get enough fresh air.A.body B.heads
• When the man hears that,he doesn't feel happy(改成because引导的原因状语从句)
• all men need air,完形填空All men need air.We __1__in air from outside our __2__every breath。When you put your face under water you cannot keep it __3__long. Aswimmer cannot swim under water very long.He needs__4__.A good swimmer may swim with his face in the water if he keeps turning up his __5__to take a breath through his mouth.If he goes down under the water ,he__6---come up for air every twenty or thirty__7__. He does not take in air through his no