This year this factory has produced ________ cars as it did last year.
| A．as more than three times many | B．more than three times many as |
| C．more than three times as many | D．three times as more than many |
The doctor __________ she sent her friend is very well known.
| A．by whom | B．at whom |
| C．whom | D．to whom |
Do you know the factory, __________ products are of high quality?
| A．which | B．whose |
| C．that | D．its |
Jim passed the driving test, __________ surprised everybody in the office.
| A．what | B．that |
| C．which | D．it |
I am going to meet Tom __________ they say is a good boy.
| A．who | B．whom |
| C．whose | D．which |
Ladies and gentlemen, please fasten your seat belts. The plane __________.
| A．takes off | B．is taking off |
| C．has taken off | D．took off |