昨天李磊没完成作业我也没完成[neither]

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昨天李磊没完成作业,我也没完成.[neither]
Li Lei didn't finish his homework. Neither did I.
I've no idea where they will go during the summer vacation. （改为同义句）
I don't know where they will go during the summer vacation.
我不知道他们暑假会去哪.