Be ________. Make sure not to make the same spelling mistake next time. 
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A
helpful
B
careful
C
useful
D
peaceful
推荐题目
The Yangzhi River is one of __________ in the world.
#44329
A
the longest rivers
B
the longest river
C
longer rivers
D
longer river
 He listened carefully, but heard ______.
#46331
A
something unusual
B
nothing unusual
C
unusual something
D
unusual nothing