More attention should be paid __________ English.
| A．to speak | B．for spoken | C．of speaking | D．to speaking |
In order to keep the balance of ecosystem, every possible means _______to deal with the problems of the over-exploiting of natural resources.
| A．has tried | B．has been tried | C．have taken | D．have been taken |
We all thought that Betty could have run _______ if she had worn the sports-shoes that day.
| A．even faster | B．more slower | C．much quickly | D．still fastest |
In that traffic accident last night the man who hit five people in a row had drunk so much that he could no longer_______ between fantasy and reality.
| A．distinguish | B．disguise | C．disturb | D．disgust |
Mr. Andrew taught his students how to develop the basic skills in the physics class, ______ everything through jokes and experiments.
| A．to explain | B．explained | C．explaining | D．explains |
Mr. Bryan is a/an _______ secretary in our office, for he is able to do tasks successfully, without wasting time or energy.
| A．effective | B．efficient | C．flexible | D．sufficient |