—____ does your father work?
—He works in a hospital.
| A．What | B．How | C．Who | D．Where |
--- Have you found the poor dog yet?
---Yes. But he was_________when we found him. The bad weather killed him.
A. dying B. died C. dead
By the time I got to the airport, the plane ________.
A. took off B. has taken off C. had taken off
The boss in the factory made the workers_______nine hours a day in the past.
A. work B. to work C. working
I am a League Member. I volunteer my time _____ others.
A. help B. to help C. helping
---What did you do on April Fool’s Day?
---I played a trick ______ my brother.
A. on B. to C. with