What should I say when presenting a sealed test paper?

When showing the sealed test paper, you can say: Now seal the test paper to ensure the fairness and safety of the exam.

The reason is that sealing the test paper can prevent cheating and tampering with the results, and ensure that every candidate has a fair chance to take the exam. By sealing the test paper, unauthorized access and theft can be prevented, thus protecting the personal information and grades of candidates.