Mail or gifts posted by companies to customers ________ advertising.
| A．are another | B．is the other | C．are other | D．is another |
Moreover, __________you may hardly believe, the examiners had decided in advance to fail half the students taking part in the exams.
| A．which | B．that | C．who | D．whom |
He is believed____________ in at his office on his way home.
| A．dropping | B．to have dropped |
| C．having dropped | D．to be dropped |
The boss____________ the worker how to do it, or the accident couldn't have happened.
| A．can't have told | B．ought to tell |
| C．could have told | D．mustn't have told |
Don't be joking. It's time to____________ your business.
| A．set out | B．take up | C．go on | D．get down |
It may not rain, but you had better take an umbrella__________.
| A．in case | B．as well | C．as least | D．in need |