Although the climate in our city is good，yet the temperature________fall to 14 centigrade below freezing point in winter.
A．should B．shall C．can D．may
一What does the sign over there read?
一No person ______ smoke or carry a lighted cigarette，cigar or pipe in this area．
A．will B．may C．shall D．must
Some people who don’t like to talk much are not necessarily shy; they _______ just be quiet people.
A．must B．may C．should D．would
—It’s the office! So you_____know eating is not allowed here.
—Oh, sorry.
A．must B．will C．may D．need
—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
