l___ cleaning the blackboard（根据首字母填空）

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am
我正擦黑板.
再问： .=.=如果真么简单我干什么要问！这是根据首字母填空~！！！！！首字母是：I问这个单词是什么(i开头的单词）
再答：有没有上下句呢？
再问： we must do something helpful,l___cleaning the blackboard and the teacher's desk very often
再答： like 介词，例如我们必须做一些有用的事，例如经常擦黑板和老师的讲台 ~~~~~~~~~~～～~~~~祝你进步，如对你有帮助，请及时采纳~~~~~~~~~~~~~~~~

l___ cleaning the blackboard（根据首字母填空） Look at the name l___ .根据首字母填空填什么? 根据首字母填空The teachers and students are l___ friends. There are many l___ of the tree on the ground.根据首字母填空根据首字母填空：It look us at l___ five hours to finish the work las Let's go and have a look at the n on the blackboard.根据首字母填空 many animals eat l___ for food根据首字母填空 All the student are l___ children 根据首字母填写单词 Long long ago,there l___ a man in the town.(首字母填空） you are cleaning the blackboard 改为祈使句 mike is the cleaning now blackboard 英语根据首字母填空：I have a l___ break for an hour.