—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 |
On a _____ morning the little girl was found _____ at the corner of the street.
| A．freezing; freezing | B．freezing; frozen | C．frozen; frozen | D．frozen; freezing |
We had to _________ the engine piece by piece for transport.
| A．take up | B．take out | C．take off | D．take apart |
The little boy was in danger. The doctors and nurses are doing him.
| A．what they can do help | B．everything they can help |
| C．what they can to help | D．all what to help |
_______ the end of last term, we had learned 3,000 English words.
| A．At | B．By | C．To | D．On |