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【答案】
【1】They are cleaning the windows.
【2】He is cleaning the desks and the chairs.
【3】Xiaoqiang can help her.
【4】They are cleaning the floor.
【5】They feel very tired, but very happy.
【解析】
【1】由文中句子“Xiaoxue and Maomao are cleaning the windows.”可知。
【2】由文中句子“Pingping is cleaning the desks and the chairs.”可知。
【3】由文中句子“Xiaoqiang can help her clean them.”可知。
【4】由文中句子“Feifei and Pengpeng are cleaning the floor.”可知。
【5】由文中句子“They are very tired, but they are very happy.”可知。