—Why does the lake smell terrible?
—Because large quantities of water_______________.
| A．have polluted | B．is being polluted |
| C．has been polluted | D．have been polluted |
.European football is played in 80 countries, _______it the most popular sport in the world.
| A．making | B．makes | C．made | D．to make |
The news reporters hurried to the airport,only_______the film stars had left.
| A．to tell | B．to be told | C．telling | D．told |
Helen had to shout_____.
| A．making herself | B．to making herself hear |
| C．making herself heard | D．to make herself heard |
Having been attacked by terrorists,______.
| A．doctors came to their rescue | B．the tall building collapsed |
| C．an emergency measure was taken | D．warnings were given to tourists |
The murderer was brought in, with his hands ______behind his back.
| A．being tired | B．having tied | C．to be tied | D．tied |