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We must be careful (小心的) when we     the road.

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careful    carefully   more careful    more carefully  
can    may    must    could  
may    can    might    should  
because    but    so    if  
become addicted    get to addict    be addicting    have addicted  
should  needn't  cannot  must  
by    over    through    across  
should  needn't  cannot  must  
don't  aren't  will  must  
don’t  aren’t  will  must  
Must   Should   Ought to   Do  
as careful as    as carefully as    as more careful as    as more carefully as  
around    through    across    into  

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