The fact has worried many scientists ________the earth is becoming warmer and warmer these years.
| A．what | B．which | C．that | D．whose |
Modern teaching equipment as well as tens of computers _______ to the village school last week.
| A．were sent | B．was sent |
| C．has sent | D．had been sent |
The number of air crashes that _______ in developing countries _________ increasing.
| A．happens; is | B．happen; is |
| C．happens; are | D．happen; are |
Bill suggested ________ a meeting on what to do for the Shanghai Expo during the vacation.
| A．having held | B．to hold |
| C．holding | D．hold |
_________many times, he finally understood it.
| A．Told | B．Telling |
| C．Having been told | D．Having told |
This morning, I rushed to the library, only ________ that its door was still locked.
| A．to be found | B．to find |
| C．finding | D．found |