Having been attacked by terrorists, ______.
| A．doctors came to their rescue | B．the tall building fell down |
| C．an emergency measure was taken | D．warnings were given to tourists |
________more attention, the work would have been done better.
| A．Given | B．o give | C．Giving | D．Having given |
Most air pollution is caused by the burning of _________ like coal, gas and oil.
| A．fuels | B．articles |
| C．goods | D．products |
I bought a dress for only 10 dollars in a sale; it was a real _________.
| A．exchange | B．bargain |
| C．trade | D．business |
—Shall we go out for a walk?
—Sorry. This is not the right _________ to invite me. I am too tired to walk.
| A．moment | B．situation |
| C．place | D．chance |
The top leaders of the two countries are holding talks in a friendly _________.
| A．atmosphere | B．state |
| C．situation | D．phenomenon |