根据反意疑问句的用法,完成下列句子的填空。 —You haven't been here long,_______ you ? — No, I haven't . I am a newcomer here. Neither you nor I have done such silly things,______ we? What a long time we've been waiting,_______ it? Mrs. Black doesn't believe her son is able to design a digital camera,_____ she? It must have rained last night, _______it? John , you mop the floor,_____ you ? Let's have a break , ______ we?