______ you keep trying till the end, you will never know how strong you are!
A. Although B. If
C. Unless D. Because
---Look! The light is still on. Is Mr Wu working in his office？
---No, it _____ be Mr Wu. He has gone to Nanjing for a meeting.
A. needn’t B. mustn’t
C. can’t D. wouldn’t
The fire lasted half an hour before it was ______ by the firemen.
A. put out B. blown out
C. taken out D. cut out
--- Do you like vegetable salad?
--- Yes, it ____ so nice! I’d like to have some more.
A. smells B. tastes
C. feels D. sounds
---Why didn’t you accept such a good job?
---Oh, it’s _________ my ability, so I had to give it up.
A. across B. under
C. over D. beyond
I sent ______ e-mail to Amy to say thanks for her help with my study.
A．a B． / C．an D．the
