If we had taken such effective measures much earlier, the river so seriously now.
| A．is not polluted | B．would not be polluted |
| C．had not been polluted | D．would not have been polluted |
"We can't go out in this weather，" said Bob，__________ out of the window.
| A．looking |
| B．to look |
| C．looked |
| D．having looked |
It is widely accepted that young babies learn to do things because certain acts lead to __________.
| A．rewards |
| B．prizes |
| C．awards |
| D．results |
There was such a long queue for coffee at the interval that we __________ gave up.
| A．eventually |
| B．unfortunately |
| C．generously |
| D．purposefully |
An invention is a new way of solving a problem, so try our best to think of many __________ and unusual ways.
| A．varying |
| B．variety |
| C．varied |
| D．variation |
This photo of mine was taken __________ stood the famous Eastern Bright Pearl in Shanghai.
| A．which |
| B．in which |
| C．where |
| D．there |