Candidates ______ remain in their seats until all the papers have been collected.
| A．must | B．shall | C．may | D．can |
. --- I think the waiter has forgotten us. We ________ here for over half an hour!
--- I think you’re right. He probably thinks we have already ordered.
| A．are waiting | B．have been waiting |
| C．have waited | D．will wait |
. When she woke up, she realized that things she had dreamed about could not _______ have happened.
| A．possibly | B．exactly | C．certainly | D．usually |
Mr. John was always _______ the poor and the sick, often providing them with free medical care.
| A．tended by | B．absorbed in | C．reminded of | D．concerned about |
--- Excuse me, would you mind answering a few questions?
--- Well, I don’t know. I’m in rather a hurry_____.
| A．seriously | B．actually | C．immediately | D．anxiously |
He seemed to be looking for the words ____ he could express his idea.
| A．for which | B．with which | C．for that | D．with that |