_____ the environment is important for human beings.
---May I _________ your CD? ---Yes. How long will you _________ it?
She was laughing and crying_________ the same time.
---_________ is the banana milk shake? ---Five yuan a bottle.
You_________ get up at once, or you’ll be late for class.
---How are you going to become a basketball player? ---I’m going to __________ every day.