Remind the teacher: you can report the situation to the tutor or administrator in charge of the paper and ask them to remind the teacher who has not completed the review to finish it as soon as possible.

Submit an application for extension: If you can't contact the teacher who hasn't finished the review, or the teacher can't finish the review within the specified time, you can submit an application for extension to the relevant institution or tutor, asking for an extension of the paper submission time.