have fun doing sth.做某事有乐趣,是固定词组,所以discuss应该用动名词形式,故填discussing。 8. After ___(整理)up his bedroom, he went out for a walk. 答案:tidying 解析:句意:整理他的放房间之后,他出去散步。tidy收拾,整理,动词。在when, before, after, while, once, while...