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We need clean air and water,so we    protect the environment.(  )A.can B.may C.must D.Might

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We need ten minutes if we want a clean shower.  We should put in enough clothes when we wash them in washing machines.  You can keep yourself clean by having a shower for five minutes.  Don’t let the water run when we brush our teeth and wash dishes.  
We need ten minutes if we want a clean shower.  We should put in enough clothes when we wash them in washing machines.  You can keep yourself clean by having a shower for five minutes.  Don’t let the water run when we brush our teeth and wash dishes.  
because    but    so    if  
sea water is widely used than fresh water  there is very little water for our living  there is 71% of fresh water  we don’t need to worry about water  
We need ten minutes if we want a clean shower.  We should put in enough clothes when we wash them in washing machines.  You can keep yourself clean by having a shower for five minutes.  Don’t let the water run when we brush our teeth and wash dishes.  
sea water is widely used than fresh water  there is very little water for our living  there is 71% of fresh water  we dont need to worry about water  
by which    without which    that    on which  
Even though  So long as  Just as  Now that  

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