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(1分)Be careful when you    (横穿) the busy street.

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very  so  too  enough  
be careful   to be careful   to care   to have been careful.  
enough careful; at; which    too careful; at; where    careful enough; on;at which    too careful; on; that  
be careful    to care    have cared    to have been careful  
should  needn't  cannot  must  
very  so  too  enough  
by    over    through    across  
should  needn't  cannot  must  
don't  aren't  will  must  
don’t  aren’t  will  must  
careless  beware  careful  carelessness  
very careful   too careful   carefully enough   enough careful  
around    through    across    into  
crash  pollute  spot  stain  

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