______the news, so far, has been good, there may be bad days ahead.
| A．when | B．while | C．If | D．Since |
He became inspired when he thought about helping ordinary people _________to cholera.
| A．expose | B．exposing | C．to expose | D．exposed |
At first, my new surroundings were difficult _________
| A．to be tolerated | B．tolerating | C．to tolerate | D．being tolerated |
There is a system ________the waste is disposed of using the principles of ecology.
| A．which | B．where | C．that | D．at which |
.Only when your identity has been checked ________.
| A．you are allowed in |
| B．you will be allowed in |
| C．will you allow in |
| D．will you be allowed in |
The Southern States wanted to ______ the Union, so the American Civil War ______.
| A．get away with; broke up |
| B．get away from; broke up |
| C．break away from; broke out |
| D．break away from; was broken out |