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﹣What do we have to do when there is much haze(霾)? ﹣In order not to     the dirty air, we should g...

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What time; on    When; on    What time; in    When; in  
don’t have to  oughtn’t to  mustn’t  can’t  
don’t have to    oughtn’t to    mustn’t    can’t  
don’t have to    oughtn’t to    mustn’t    can’t  
don't have to    oughtn't to    mustn't    can't  
what can we do it    when can we do it    where can we do it    where we can do it  
How    Where    What    When  
will finish; do   have finished, am doing   finish, will do   finish, do  
what to do    how to do it    when to do    when to do  
what I will do    what will I do    when I will do it    when will I do it  
don’t have to   oughtn’t to   mustn’t   can’t  
did    could have done    have done    should do  
when can we do it    when we can do it   where can we do it    where we can do it  
So we don’t  Neither we do  Neither are we  So do we  
what can we do it    when can we do it    where can we do it    where we can do it  
don't have to    oughtn't to    mustn't    can't  
What    Where    When      How    
don't have to  oughtn't to   mustn't  can't  

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