The problem ________now is very important．
A．being discussed B．discussed
C．discussing D．to be discussed
— According to my grandma, it is a good idea to eat chicken soup when you have a cold．
—________, scientists agree with her．
A．Sooner or later B． Once in a while
C．To be exact D．Believe it or not
— Catherine, I have cleaned the room for you．
— Thanks, but 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
_______from the top of the tower, the north foot of the mountain is a sea of flowers．
A．Seeing B．Having seen
C．Seen D．To see
— I’d better__________ now．The water is boiling in the kitchen．
— Good-bye．
A．ring off B．ring up C．ring in D．ring back
Only by shouting at the top of his voice__________．
A．he was able to make himself hear
B．he was able to make himself heard
C．was he able to make himself hear
D．was he able to make himself heard
