情境探究，回答问题。（8分）
情景之一：周末，小明忘了完成数学家作业，周一到校时，他把隔壁班同学的作业本交给老师，冒充自己的作业本。
（1）事后，小明应该                                           （2分）
（2）理由：                                                   （2分）
情景二：乐乐学习很刻苦，成绩也很好，就是对集体不关心，集体的活动都不参加，他认为学习好坏是靠个人劳动的，集体是靠不住的。
（1）乐乐的想法是否正确？                                     （2分）
（2）理由：                                                   （2分）
情景三：早上你到学校发现同桌买了个最新款的手机。
（1）你是否会让父母给你买：                                   （2分）
（2）理由：                                                   （2分）
情景四：学校门口的小卖店中经常出售一些充满暴力、色情口袋书。
（1）你会：                                                （2分）
（2）理由：                                                （2分）

内燃机的铭牌上标有“3000r/min”的字样，正常工作1秒钟对外做功____次．

完形填空。
    Hello. I'm Jenny. I have a best friend.   1 name is Amy. We are in the same school. We both can sing and dance well. She is as  2 as me.
    At school, my teachers all can make 3   happy. But we must4  white blouse with the long sleeves. I am good 5   maths and English. She 6  English. She thinks it's difficult. Yesterday we7   a party at school. We enjoyed ourselves.
    At spare time, my favourite8   is winter. I like 9  snowmen in winter. But she likes eating ice creams in summer. What a pity!
    In two months' time, we are going to go to middle school. We are very busy every day. We  10   harder than now.

制作人的口腔上皮细胞的临时玻片标本时，用于漱口的液体、载玻片上滴加的液体、染色用的液体分别为（    ）

m的平方根是n+1和n﹣5，那么mn=____．