__________ time is pressing, we senior three students should work extra hard and stick it out to the end.
| A．If | B．As |
| C．Although | D．Unless |
She was walking down the road _______ she heard someone shouting for help.
| A．when | B．suddenly |
| C．until | D．before |
The fire went on for quite some time _______ it was brought under control.
| A．when | B．since |
| C．after | D．before |
He made a mistake, but then he corrected the situation _______ it got worse.
| A．until | B．when |
| C．before | D．as |
Someone called me up in the middle of the night, but they hung up ________ I could answer the phone.
| A．as | B．since |
| C．until | D．before |
She is getting better by degrees, but it will be some time _____ she is completely well.
| A．that | B．since |
| C．when | D．before |