—Catherine, I have cleaned the room for you.
—Thanks. You______it. I could manage it myself.
A．needn't do B．needn't have done
C．mustn't do D．shouldn't have done
—She looks very happy. She ______ have passed the exam.
—I guess so. It’s not difficult after all.
A．should B．could C．must D．might
Mr. White _____ at 8:30 for the meeting, but he didn't show up.
A．should have arrived B．should arrive
C．should have had arrived D．should be arriving
He did not regret saying what he did but felt that he it differently.
A．could express B．would express
C．could have expressed D．must have expressed
—I can’t give up smoking, doctor.
—For your health, I’m afraid you ________.
A．may B．can
C．have to D．must
We ________ fight against pollution.
A．may B．should
C．mustn’t D．needn’t
