Look!Hes running so fast.Hard to ---- his leg was once broke

Look!Hes running so fast.Hard to ____ his leg was once broken.A.find B.imagine为什么?还有一个how can you expect to learn ____ when you never listen?A.anything B.something C.everything答案是A我觉得怪怪的,是不是因为这是疑问句就用anything?翻译起来没有sth 顺啊,为什么选A呢?