The rise of oil prices made scientists search for new energy resources ______ oil．
| A．replace | B．replacing | C．to replace | D．replaced |
Give yourself 10% of________is left for your work and let me have the rest.
| A．which | B．that | C．what | D．where |
The school has developed an online system________ students can choose their own teachers.
| A．which | B．when | C．that | D．where |
We should do what we have to do________ we can do what we want to do in the future.
| A．so that | B．in case |
| C．for fear that | D．now that |
—Is that the small town you often refer to?
—Right, just the one________you know I used to work for years.
| A．that | B．which | C．where | D．what |
Our attitude towards life is________makes the difference between our being happy or not.
| A．that | B．whether | C．what | D．which |