1 . The popular belief has been challenged after a recent research ________ cartilage(软骨) in human joints can’t repair itself.

A．where

B．whether

C．when

D．that

2 . People have no idea ______had happened on the plane.

A．how

B．what

C．which

D．where

3 . Now that energy prices are rising so rapidly, further prices are very uncertain, and the risk a new investment depending on them may fail is greater.

A．by which

B．of

C．that

D．in that

4 . Bob made a promise to the manager ________ the work would all be finished on time.

A．that	B．what
C．which	D．whether

5 . After the deadly collision, the relatives of the kids protected them from the knowledge_______         their parents had already passed away.

A．when

B．where

C．that

D．which

6 . There is concern __________ the construction company that built the tower block had not followed fire safety rules. (用适当的词填空)

7 . One theory    this phenomenon    acupuncture reduces pain suggests that acupuncture_____ pain signals from reaching the brain.

A．explaining; that; should block	B．which explains; where; can block
C．that explains; where; block	D．explaining; that; blocks

8 . Anderson made the announcement at the conference______the company would be closing.

A．that

B．when

C．where

D．whether

9 . The journalist echoed the villagers’ doubt in the newspaper _________ the tourist resorts would really benefit the local economy. (用适当的词填空)

10 . The employers have reached some consensus as to workers from different positions ________ their workers can be offered many carrots, such as training abroad, and yearly bonus.

A．when

B．where

C．that

D．who