24. There were two boys in the lab,__________did the experiment successfully.
| A．the clever of whom | B．the cleverer of whom |
| C．the clever of them | D．the more clever of them |
_____ to make a speech, he said he would be glad to.
| A．When asked | B．When asking |
| C．When he was asking | D．When to ask |
I am not accustomed to _______when studying or working, so please remember this and don’t do it again.
| A．be interrupting | B．have interrupted |
| C．being interrupted | D．interrupting |
----Excuse me, can you tell me if there is a flight available to America today?
----Well, Flight 5042 to USA ________ off at 15:45
| A．takes | B．took | C．will be taken | D．is taken |
______ I already know what career I want to follow.
| A．Young as I am | B．I am as young |
| C．As I am young | D．As young I am |
_______ makes the book so extraordinary is the creative imagination of the writer.
| A．That | B．What | C．Who | D．Which |