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Mr. Gao and Mr. Wu are math teachers. They     us math.

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Yes, I can.    Yes, you can.    No, you can’t.    No, I can’t.  
explains; to    has explained; for    explained; with    has explained; to  
where    what    which    that  
for; our    at; our   with ;our    at ;us  
to not shout  not to shout  don't shout  not shouting  
left;take  forgot;to take   left;to bring  forgot;bringing   
look at    look for    look up    look after  
don’t    not to    won’t    not  
A. must    can    shouldn’t    can’t  
shouldn’t    may not    can’t    mustn’t  
can't  might  could  must  
may be    mustn’t be    can’t be    must be  
everybody  anybody  somebody  nobody  
go   has gone   has been   would go  
what to deal with    what to be dealt with    how to deal with    how to be done with  
mustn’t    can’t    needn’t    shouldn’t  
has gone    goes    has been    would go