问题补充：
Don’t worry. He is to take care of little Betty.
A. enough carefully
B. enough careful
C. carefully enough
D. careful enough
答案：
A. enough carefully
B. enough careful
C. carefully enough
(答案→)D. careful enough
解析：enough 修饰形容词/副词时要位于其后，根据本句的内容有be 动词is ，说明要用形容词，故选D
