But often the drivers just go by, taking the human traffic for granted.
| A．sign | B．symbol | C．signal | D．mark |
I was nervous and pretended not __________, in order to leave a nice first impression on the interviewer.
| A．to be | B．be | C．being | D．been |
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 |