When we climbed up to the top of the mountain, we were all ___________.
| A．out of the breath | B．short of the breath |
| C．out of breath | D．short of breaths |
I have no idea ________ he will come back.
| A．where |
| B．when |
| C．what |
| D．which |
The rescue team made every ________ to find the missing mountain climber.
| A．force |
| B．energy |
| C．effort |
| D．possibility |
We are faced with a problem ________ we don’t have enough natural resources.
| A．which |
| B．what |
| C．that |
| D．whose |
The doctor are trying to reduce the patient’s fear ________ he would die of the disease.
| A．which |
| B．when |
| C．that |
| D．if |
There is a strong probability ________ Mr Brown will be promoted to a higher position.
| A．that |
| B．which |
| C．what |
| D．how |