Be . Make sure not to make the same spelling mistake next time.A. peacefulB. carefulC. hel

问题补充：

Be . Make sure not to make the same spelling mistake next time.

A. peaceful

B. careful

C. helpful

D. thankful

答案：

A. peaceful

(答案→)B. careful

C. helpful

D. thankful

解析： 根据后句的意思确保下一次不用犯同样的错误，可以判断出前句的意思是认真，细心，careful可以表示此意，故选B.