Only when I lost the opportunity to take my first job ____ how important it was to me.
A. I realized B. I had realized C, had 
I realized D . did I realize
I haven’t watched __________ of the films directed by Mr. Turner, but judging from the one I have watched, I believe he will be famous someday.
| A．any | B．none | C．all | D．either |
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 |
College graduates are caught in an annoying situation between a lack of jobs if they leave and a ________ on higher education if they stay.
| A．compromise | B．squeeze | C．burden | D．passion |