He made another wonderful discovery, ______ of great importance to science.
| A．which I think is | B．which I think it is |
| C．which I think | D．I think which is |
The police tried to get some clues from the suspect, but he remained ______．
| A．silent | B．quiet | C．calm | D．still |
The engine of the ship was out of order and the bad weather _____ the helplessness of the crew at sea．
| A．turned out | B．resulted from | C．added to | D．made up |
The electric library made it impossible for teachers to have ______ to a large amount of information online．
| A．way | B．method | C．access | D．means |
Some kinds of birds in winter fly to the south to ______ the cold in the north．
| A．get away from | B．come up with |
| C．break away from | D．put up with |
We must apply what we have learned to our daily work because in no case _____ from practice.
| A．should theory separate | B．should theory be separated |
| C．theory should separate | D．theory should be separated |