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 |
— I’m terribly sorry to keep you waiting for so long.
— _______.
| A．Never mind. | B．That’s right. | C．You are welcome. | D．Don’t mention it. |
It’s extremely dangerous for the drivers to _______ speed as the traffic lights are changing.
| A．pull up | B．put up | C．rise up | D．pick up |
The government is now trying to provide _______ health benefits to all citizens in China.
| A．significant | B．universal | C．temporary | D．professional |
With more than 17000 islands, _____ only 6000 are inhabited, Indonesia is the world’s largest archipelago (岛国).
| A．on which | B．for which | C．of which | D．along which |
— Where will you start your work after graduation？
— It’s not been decided yet. I _______ continue my studies for a higher degree.
| A．need | B．might | C．would | D．must |