It is such that you must on it.
| A．hard work; work hard | B．a hard work; hard work |
| C．work hardly; work hard | D．hard work; hard work |
-- Excuse me, sir, smoking in the gas station.
-- Oh, I'm really sorry.
A. doesn't allow B. isn't allowed C. aren't allowed
-- The boy can speak both English and Japanese ______ he is only ten.
-- Wow, what a clever boy!
A. if B. because C. though
---Nick, would you mind out of the bathroom?
--- Sorry. I won't be long.
A. come B. to come C. coming
-- does your cousin go to the gym?
-- Twice a week.
A. How long B. How often C. How soon
-- Is that girl Susan?
-- It ______ be her. She left for Beijing yesterday.
A. needn't B. can't C. mustn't