We should _____ the power when our TV or computer is not used.

---Don’t forget to ______ your sister with you when you come here next time, Lily!---OK, I won’t.

 __________ good grades, you should try to study harder.

—Talking loudly in a library is impolite.—In fact, we should also  take care not to cough or sneeze loudly in public.

 —John is in a bad mood these days. Do you know why?—His grandfather has just passed away. Let’s try to _______.