If better use is ______ of your spare time, you will make still greater progress in it.
| A．spent | B．made | C．taken | D．thought |
These diagrams are especially helpful when we have a concrete problem ________ at hand.
| A．be solved | B．to solve |
| C．solved | D．being solved |
At last, we found ourselves at the foot of a hill with trees providing shade and ________ down to eat our picnic lunch.
| A．sitting | B．having sat |
| C．to sit | D．sat |
Launched in March 2010, China Face has been a daily news feature ________ on a Chinese individual.
| A．being focused | B．focusing |
| C．to be focused | D．to focus |
We entered the café and sat down by the window, waiting ________.
| A．to serve | B．to be served |
| C．serving | D．served |
With so many exercises ________， the students are having a hard time.
| A．finished | B．finishing |
| C．to finish | D．being finishing |