1. A variety of small clubs can provide _____ opportunities for leadership, as well as for practice in successful group dynamics.
[A] durable [B] excessive
[C] surplus [D] multiple
2. By turning this knob to the right you can _____ the sound from this radio.
[A] amplify [B] enlarge
[C] magnify [D] reinforce
3. Under the _____ confronting them it was impossible to continue the strike any longer.
[A] surroundings [B] settings
[C] circumstances [D] environments
4. We have the system of exploitation of man by man.
[A] cancelled [B] abolished
[C] refused [D] rejected
5. We shall probably never be able to _____ the exact nature of these sub-atomic particles.
[A] assert [B] impart
[C] ascertain [D] notify
参考答案：DACBC
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