His answer was _______, so no one could make out what he meant.
| A．ambiguous | B．unconscious | C．transparent | D．explicit |
—You seem to be on top of the world.
—Of course. There’s more exciting than seeing your name in print.
| A．everything | B．nothing |
| C．anything | D．something |
If you stay here longer, you may. But you leave before this weekend.
| A．will; must | B．can; can |
| C．may; will | D．may; shall |
All flights owing to the heavy fog, many passengers could do nothing but take trains.
| A．to be cancelled |
| B．were cancelled |
| C．have been cancelled |
| D．having been cancelled |
More than one worker sent to the training center to improve their working skills in the past three years.
| A．is | B．has been |
| C．are | D．have been |
We can never forget the days we worked together and the days we spent together.
| A．when; which | B．which; when |
| C．what; that | D．on which; when |