—__________
—Thank you.
| A．Have a good day! | B．Good morning! |
| C．How are you？ | D．Goodbye! |
What is the best way you think of ______ the environment?
| A．to protect | B．protecting | C．protect | D．protected |
---How does your brother like the song Two Butterflies?
---Great! He _____ such a beautiful song before.
| A．doesn’t hear | B．never hear | C．is never heard | D．has never heard |
--- How are you feeling here?
--- It’s quite hot. I don’t know _____ to go or stay.
| A．how | B．when | C．whether | D．where |
You_______ play with the knife. You ______ hurt yourself.
| A．mustn’t; may | B．mustn’t; must | C．shouldn’t; must | D．can’t; should |
Workers can’t be made ________ for twelve hours a day.
| A．work | B．to work | C．working | D．worked |