—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 |
Please ______ that you have closed all the windows and turned off the lights before you leave the room
| A．make sure | B．be sure | C．bring out | D．hold up |
When he was sixty years old, he _____ his hometown.
| A．returned | B．returned back | C．returned to | D．went back |
______ you understand the rule, you can do it well.
| A．For | B．As | C．Once | D．While |
The room ____ voices of the children.
| A．filled with | B．was filled with | C．full of | D．was full with |
I can hardly heat the radio. Would you please ______?
| A．turn it on | B．turn it down | C．turn it up | D．turn it off |