Food safety is important. Rules____ to stop people from food pollution.

You       play computer games for a long time. It’s bad for your eyes.

---I think Miss Gao must be in the library. She said she would go there. ---No, she ___________ be there. I have just been there.

Anyone whose performance is best received by the public____ be given an opportunity to show their talents at the Great Hall of the People in Beijing.

—Must I return the hook tomorrow morning? —No, you _ .You can keep it longer.