The first exercise should be done in class and the rest ____

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The first exercise should be done in class and the rest _________ at home.
这里为什么填 are to be done

1.exercise泛指“锻炼”时,做不可数名词,如：take exercise 锻炼身体 take more exercise多锻炼 2.exercise表示“体操”或“练习（题）”时是可数名词,要用复数形式.如：do morning exercises（做早操）,do eye exercises（做眼保健操）,do English exercises（做英语练习）.
在这题当中,exercise 明显是练习题的意思,The first exercise should be done in class and the rest （exercises）___are to be done______ at home.
这里省略了exercises,是复数形式,所以谓语要用复数 are.

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