单项选择题

--I always look out when crossing the street.
--You are right. You can't be too ______.()

A. nervous
B. careful
C. careless
D. hurried

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单项选择题
In general, the amount that a student spends for housing should be held to one-fifth of the total ______ for living expense.()

A. acceptable 
B. advisable   
C. available   
D. applicable
单项选择题
I thought that the three months there ______ us a lot of good.()

A. has done     
B. have done    
C. do          
D. had done
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