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根据所学知识回答： （1） 下图是实验室制取气体的发生装置和气体收集装置。请你回答下列问题： ①写出实验室加热氯酸钾和二氧化锰的混合物制取氧气的化学符号表达式。 ②请将上图中A装置的长颈漏斗和玻璃导管补画完整。 ③用C装置加热高锰酸钾制氧气时，试管口应放一团棉花，为什么？。 ④实验室用过氧化氢溶液制取氧气，若从控制反应速率和节约药品的角度考虑，应选择的发生装置是（填字母序号）。 ⑤D、E、F、G都是实验室中A teacher once told each of her students to bring a clean plastic bag and a bag of potatoes to schoo1．For every person they didn’t want to forgive in their lives，they were told to choose a potato，write on it the name and the date，and put it in the bag．Some of their bags were very heavy.They were then told to carry this bag with them everywhere for one week．They would put it beside their bed at night，on the seat when sitting in a car or on a bus，and next to their desk at schoo1．Days of carrying the bags around with them got the students to get to know what a weight they were carrying in their hands．And they had to pay attention to it all the time (1)__________they didn’t forget it．(2)As time passed by，the potatoes went bad and smelt very terrible．Too often we think of tolerance(容忍)as a gift to other people，and it clearly is for ourselves! Sometimes we choose to keep our sadness in our hearts，we have to carry them around all our lives．If everyone learns to forgive，our world will become a better one．【小题1】在(1)句的空白处填入一个适当的词语使句意完整、上下文通顺。_____________【小题2】将(2)句译成中文。_______________________________________【小题3】回答问题：How long did the teacher tell his students to carry the bag with them?_____________________________________________________________________【小题4】在文中找出与Once each student was told to bring a clean plastic bag and a bag of potatoes to school意思相近的句子______________________________________.【小题5】在文中找出最能表达该短文主题的句子。 _____________________________________________________________________