If you         smoke, please go outside.

In China's countryside, villagers often have the same family name, but ________ not be closely related.

A: Listen! Is it Linda singing in the next room? B: No, it __________ be her. She is still in Shanghai.

If the students who killed themselves had only been more confident, their deaths ________.

----Mum, ____ I watch TV now? ----No, you ____. You _____ finish your homework first.