Bicycling is good exercise ；___________, it does not pollute the air.
| A．nevertheless |
| B．besides |
| C．otherwise |
| D．therefore |
All the elder people ______ at the party were those _____involved in (参与)community service.
| A．thankful; honestly | B．interested; eagerly |
| C．present; actively | D．important; patiently |
In the past, ice used to ______ used to ______ the air in a room.
| A．be ;cooling | B．be; cool | C．being; cool | D．being; cooling |
The old man’s _______ pity on the snake led to his own death.
| A．take | B．taking | C．being taken | D．have |
________ many times, but he still could not understand it.
| A．Having been told | B．Tough he had been told |
| C．He was told | D．Having told |
Faced with a bill for $ 10,000,_________.
| A．John had to take an extra job | B．the boss has given John an extra job |
| C．an extra job has been taken | D．an extra job has been given to John |