【C19】A．destroyB．ruinC．damageD．deteriorate

【C12】A．destroyB．createC．maintainD．reduce

Dumped waste might contaminate water supplies.A．destroyB．decreaseC．delayD．pollute

Dumped waste might contaminate water supplies.A．destroyB．decreaseC．delayD．pollute

【C8】A．destroyB．disturbC．mistakeD．misuse

【C15】A．destroyB．disturbC．mistakeD．misuse

After four years in the same job his enthusiasm finally ________. A) deteriorated