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1. They are doing housework. (¸ÄÒ»°ãÒÉÎʾ䲢×÷¿Ï¶¨¡¢·ñ¶¨»Ø´ð£»¸Ä·ñ¶¨¾ä)
2. The students are cleaning the classroom.(¸ÄÒ»°ãÒÉÎʾ䲢£¬×÷¿Ï¶¨¡¢·ñ¶¨»Ø´ð£»¶Ô»Ïß²¿·ÖÌáÎÊ)
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1. They are doing housework. (¸ÄÒ»°ãÒÉÎʾ䲢×÷¿Ï¶¨¡¢·ñ¶¨»Ø´ð£»¸Ä·ñ¶¨¾ä)
2. The students are cleaning the classroom.(¸ÄÒ»°ãÒÉÎʾ䲢£¬×÷¿Ï¶¨¡¢·ñ¶¨»Ø´ð£»¶Ô»Ïß²¿·ÖÌáÎÊ)

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