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 |
We should learn from various civilizations, ancient and modern, andbenefits from them.
| A．conclude | B．suspect |
| C．absorb | D．announce |
The well-known actress last night put on a white tight skirt on purpose to _______ that she was not pregnant(怀孕的).
| A．classify | B．satisfy |
| C．simplify | D．clarify |
Hundreds of people, policemen and civilians included, have got injured as a result of the political _______ in Hong Kong.
| A．conflict | B．reform |
| C．progress | D．demand |
Nowadays many university graduates are facing the __________ about whether they should apply for a job or continue further study.
| A．position | B．dilemma |
| C．opportunity | D．possibility |
Tom has agreed to let me use his computer to surf the Internet, and _______ I’m treating him to a good dinner at the newly-built restaurant just around the corner.
| A．in charge | B．in place |
| C．in turn | D．in return |