If we don't do that ,there must be someone ______ do it for us.填一词

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Ifwedon''tdothat,theremustbesomeone______doitforus.填一词Ifwedon''tdothat,theremustbesomeone______doitfor

If we don't do that ,there must be someone ______ do it for us.填一词
If we don't do that ,there must be someone ______ do it for us.
填一词

If we don't do that ,there must be someone ______ do it for us.填一词
填else.其他
someone else 其他人