Tom can play drums, but Sam can play tennis.
---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.
The fire lasted half an hour before it was ______ by the firemen.
--- Do you like vegetable salad? --- Yes, it ____ so nice! I’d like to have some more.
---Why didn’t you accept such a good job? ---Oh, it’s _________ my ability, so I had to give it up.
I sent ______ e-mail to Amy to say thanks for her help with my study.