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
---Did you see who the driver was?
---No, the car ran so fast _____ I couldn’t get a good look at his face.
A. that B. which C. as D. after
