It is pretty well understood _______ controls the flow of carbon dioxide in and out the atmosphere today.
| A．that | B．when |
| C．what | D．how |
Last week we had some great speeches. The headmaster together with some other teachers to attend it, too.
| A．were invited | B．has invited |
| C．was invited | D．Invited |
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 |