The explorer got a disease in blood for the of fresh vegetables and fruit.
| A．sake |
| B．lack |
| C．ignorance |
| D．benefit |
At the beginning of the class, the noise of doors__________ could be heard many times.
| A．opened and closed |
| B．to be opened and closed |
| C．being opened and closed |
| D．to open and close |
A simple 45-minute operation __________ by scientists is hoped to cure blindness in six years.
| A．being developed |
| B．developed |
| C．to develop |
| D．developing |
__________ in a well-known university is what every-body wishes for.
| A．Educated |
| B．To educate |
| C．Educating |
| D．Being educated |
Taking physical exercise regularly is an effective way to avoid __________ with the flu.
| A．to infect |
| B．infecting |
| C．to be infected |
| D．being infected |
—Is there any possibility of the film __________ in Paris International Festival?
—Not in the least, because the audience generally think little of it.
【选项 】
| A．trying out |
| B．tried out |
| C．to try out |
| D．being tried out |