My friend, who ________ on the International Olympic Committee all the time, is retiring next month.
| A．served |
| B．is serving |
| C．had served |
| D．has served |
We heard an explosion and________for cover.
| A．hid |
| B．dived |
| C．walked |
| D．found |
China is one of the largest countries in the world，________9.6 million square kilometres.
| A．to cover |
| B．covered |
| C．covers |
| D．covering |
Robert is said________abroad, but I don't know what country he studied in.
| A．to have studied |
| B．to study |
| C．to be studying |
| D．to have been studying |
________down the radio—the baby's asleep in the next room.
| A．Turning |
| B．To turn |
| C．Turned |
| D．Turn |
He was suddenly________with a strange illness when he was about to finish the work.
| A．hit |
| B．caught |
| C．controlled |
| D．attacked |