plants can not grow well 这里填什么 water and air

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• Germs can easily get__a human body through the nose.应该填什么?还有There will be no life___air or water可以填without吗?
• forests can help to stop water from (f 这里填什么)away
• We can not live w____ water and air.填什么,为什么,整句的意思是什么?
• we can't live w_____ air or water 横线上填什么
• He is busy preparing for the speech,so he cann’t help_____the experiment with usHe is busy preparing for the speech,so he can’t help_____the experiment with us.A.carry out B.carrying out C.carried out D.with carrying out为什么选A.我知道can't help to do sth 表示不能帮忙做某事,我觉得这里是不能帮忙做某事,为什么省略了to?Weather_________(permit),we’ll go to the countryside and enjoy the fresh air.为什么填permitting,为什么要用-ing形式？
• some foreign students can speak chinese so well that if you didn"t see them .you would __them for chinese空中为什么是填take而不是think?这里take是什么意思呢?
• We can't live without ______ water or ______ air 怎么填,为什么
• We should do as much as we can ___ water. A.for saving B.to save C.save D.tsavedWe should do as much as we can ___ water. A.for saving B.to save C.save D.tsaved答案给的是B,但我想知道C为什么不对,can不是情态动词吗,既然是后面为什么还要先加to再加动词.还有就是The man ran out ___（see） what was wrong.为什么要填to see？这里有什么语法讲究吗？谢谢。
• nothing can live without water and air这里为什么不用or
• 什么是染色体行为?
• 有三种蛋糕,五角星形、三角形、圆形.有一个孩子一个人吃了一个五角星形的蛋糕,有二个孩子吃了一个圆形的蛋糕,有三个孩子吃了一个三角形的蛋糕,最后一个有11个空蛋糕盒.问有一共有几个孩子?