What ______ you ______ when the telephone rang just now？
| A．are；doing | B．were；doing |
| C．do；do | D．do；doing |
-- The boy can speak both English and Japanese ______ he is only ten.
-- Wow, what a clever boy!
A. if B. because C. though
- Is James at home?
-- No, he Ya'an to be a volunteer.
A. has gone to B. has been to C. is going to
— 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