Mr. Smith graduated from college at the age of 23, and ___________ he has been working as a teacher in a middle school.
| A．after that | B．from then on | C．from then | D．since then |
I’m very grateful to Professor Smith, without __________ help I would have never have got this far.
| A．who | B．whose | C．whom | D．which |
My father warned me __________ going to the West Coast because it was crowded with tourists.
| A．by | B．on | C．for | D．against |
It __________ Tom that parked the car here, as he is the only one with a car.
| A．may be | B．might have been | C．must have been | D．could be |
Though he has lived in America for five years, he doesn’t intend to __________ American citizenship.
| A．apply for | B．stand for | C．take over | D．set up |
- How many people attended the exhibit?
- I’m not sure. __________ 100 people.
| A．Exactly | B．Actually | C．Roughly | D．Strictly |