He, a Nobelist, made great ______________ to researching in this area.
| A．encouragements | B．constitutions | C．breakthrough | D．contributions |
The twin brothers look so alike that it is very difficult to tell one from .
| A．other | B．another |
| C．others | D．the other |
----I just can’t help worrying about the result of my driving license test.
----. You can do nothing but wait.
| A．Just relax | B．Have fun |
| C．Watch out | D．Take your time |
He started school the same day as I did and ________ to it like a duck to water.
| A．appealed | B．took | C．catered | D．saw |
If Kate had known what was _______ for her, she would not have married Tom.
| A．in response | B．in return |
| C．in reaction | D．in store |
Halfway through the chapter _______ I hadn’t taken anything in.
| A．did I realize | B．had I realized |
| C．I realized | D．I would realize |