—Who______ it be that is knocking at the door？
—It ______ be Father，but I’m not sure．
A．can; must B．can; may
C．must; can D．may; must
---Is Blake still absent from class？
---I think he be punished if he goes on with it．
A．shall B．must
C．can D．will
Great changes__________ in our school in the past 5 years．
A．took place B．were taken place
C．have taken place D．have been taken place
It is known to us that doing eye exercises_______ our eyes，and that is to say，our eyes can_______ doing eye exercises．
A．benefits to; benefit
B．benefits; be benefited from
C．benefits from; benefit
D．benefits; benefit from
I got up early this morning，but I ________ so because I was not on duty today．
A．mustn’t have done B．needn’t have done
C．didn’t need to do D．can’t have done
It’s dangerous to have the fire _______ at home all night long．
A．to burn B．burn
C．burned D．burning
