某学科考试共有100道单项选择题，有甲、乙两种计分法．某学生有a道题答对，b道题答错，c道题未作答，则甲计分法的得分为X=a﹣$\frac{b}{4}$，乙计分法的得分为Y=a+$\frac{c}{5}$．某班50名学生参加了这科考试，现有如下结论：

①同一学生的X分数不可能大于Y分数；

②任意两个学生X分数之差的绝对值不可能大于Y分数之差的绝对值；

③用X分数将全班排名次的结果与用Y分数将全班排名次的结果是完全相同的；

④X分数与Y分数是正先关的．

其中正确的有____ （写出所有正确结论的序号）

“探究不同物质吸热能力”时，将质量相等的煤油和水分别装在两个相同的烧杯中，并测出煤油和水的初温，然后用两个相同的酒精灯加热，每隔2min记录一次温度．实验记录如表所示：

若m²+n²﹣6n+4m+13=0，m²﹣n²=____ ．

In China, primary school has more ____  (woman) teachers.
Chinese people all dress____  (they) in the best clothes when important festivals come.
The guide has collected the ____  (visit) ID cards since they arrived at this five-star hotel.
Her red dress makes her look much____ (pretty).
Cut the apple into____  (half). Then we can share them.
I am waiting for my turn____  (make) a wish at the table with my friends.
I look forward to____  (dress) up as Monkey King.
Does this pair of glasses____ (match) my jeans?
Some students don’t know how to have ____  (funny) at weekends.
The two children ____  (agree) about everything and always argued.