Wind power is an ancient source of energy ________ we may return in the near future.
| A．on which | B．by which | C．to which | D．from which |
______by some new chairs in the living room.the old ones were moved out and used as firewood.
| A．Being replaced |
| B．Replacing |
| C．To be replaced |
| D．Having been replaced |
Why don’t you try to work out the maths problem ______waiting for the teacher to tell you the answer?
| A．rather than |
| B．other than |
| C．far from |
| D．free from . |
If these measures can’t help ______such a tragedy from happening again, what’s the sense of taking them?
| A．prevented |
| B．being prevented |
| C．preventing |
| D．to prevent |
If you are someone who is easy to worry, you are more ______ to have a negative interpretation of your feelings.
| A．eventually |
| B．impossibly |
| C．hopefully |
| D．likely |
______the young man really wanted to go abroad for further study, he abandoned his dream considering the financial situation of his family.
| A．Unless |
| B．Since |
| C．While |
| D．As |