Be and you will do well in the English exam.A. carefulB. politeC. sureD. friendly

问题补充：

Be , and you will do well in the English exam.

A. careful

B. polite

C. sure

D. friendly

答案：

(答案→)A. careful

B. polite

C. sure

D. friendly

解析：词义辨析。Careful小心，认真；polite有礼貌的；sure肯定的，确定的；friendly友好的。句意：认真一点，在英语考试中你会做得更好。所以选A。