问题补充：
The doctor was immediately the little boy fell off a ladder and hurt himself.
A. asked for
B. sent for
C. waited for
D. cared for
答案：
A. asked for
(答案→)B. sent for
C. waited for
D. cared for
解析：send for派人去请…来；ask for要求得到(某物)、找(某人)、自找(麻烦)；wait for等候；care for照料、喜欢。
