Peter knows many people here. —_________________

To save water, the parents told their children ________ their teeth under a running tap.

Have you ever been to the Qinghai Lake, Jim?—Yes. That’s the most fantastic place _______ I’ve ever visited.

If (如果) he isn’t at school. Please call me _______ 453-7868. [ ]

Peter is a polite student. He is kind _____ everyone. [ ]