Large quantities of polluted water_____ into the sea so that lots of fish died.
| A．is flowing | B．was flowing | C．are flowing | D．were flowing |
Steps must be taken ______this kind of disaster will never happen again.
| A．because | B．even if | C．as | D．so that |
Please keep me informed_______ the change of your address as soon as possible.
| A．of | B．for | C．with | D．by |
One of the most important questions they had to consider was _____of public health.
| A．what | B．this | C．that | D．which |
The lady walked around the shops,______ an eye out for bargains.
| A．keep | B．kept | C．keeping | D．to keep |
I go _____to the stadium when there’s a game. But usually I watch it on TV.
| A．typically | B．anxiously | C．frequently | D．occasionally |