—______ does he want so much money?— Because he wants to buy a new camera.
______ you keep trying till the end, you will never know how strong you are!
---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.