--Why do you look pale today?
--I was very ________my mother’s illness. I stayed awake last night.
| A．concerned about | B．concerned with |
| C．concerned in | D．concerned to |
.—You were brave enough to raise objections at the meeting.
—Well, now I regret ___ that.
| A．to do | B．to be doing | C．to have done | D．having done |
---What can I do for you?
----- If you _____ see Mr. Smith, give him my regards.
| A．will | B．would | C．shall | D．should |
It has been announces that all takers ____ remain in their seats until all the exam papers have been collected.
| A．can | B．may | C．shall | D．will |
---John, how did your English exam go?
-----I thought I ____,but in fact I came in the top 10% in the class.
| A．should have failed | B．couldn’t have failed |
| C．might have failed | D．mustn’t have failed |
---I feel the house shaking.
----So do I .It ___ must be sign of an earthquake most probably. Let’s hurry to leave here.
| A．ought to | B．could | C．can | D．might |