Some countries are increasing their use of natural gas, and other forms of ______.
| A．source | B．material |
| C．power | D．energy |
At one time, she is fine, ________ at another, she is abnormal.
| A．and | B．or | C．but | D．so |
We could have done something meaningful in the time it ________ to watch that boring movie.
| A．has taken | B．took | C．had taken | D．takes |
The farmer used wood to build a house ________ to store grain.
| A．that | B．in which | C．which | D．what |
The little girl ________ a foreign language fairly quickly.
| A．picked up | B．got up | C．stepped up | D．made up |
________ a bike, she cycled home.
| A．Bought | B．To buy | C．Being bought | D．Having bought |