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It’s important to pay attention to your s    when you travel alone.(安全)

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cannot    should    must    needn't  
can’t    should    must    needn’t  
which; that    that; which    what; that    that; that  
which; that   that; which   which; which   that; that  
can    would    may    should  
pay    pay off    pay for    pay back  
which; that    that; what    which; which    that; that  
can not    should    must    needn't  
which;it  that;it  which;that  that;that  
pay for  refer to   ask for  point to  
can't  should  must  needn't  
condition  income  credit  status  
cannot    should    must    needn’t  
pay   pay off   pay for   pay back  
important something  anything important  something important  important anything  
must  should  cannot  needn't