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2. Over the past ten years, natural gas production has remianed steady, but _______ has risen steadily.
A. consumption
B. dissipation
C. disposal
D. expenditure

3. Doctors are often caught in a _______ because they have to decide whether they should tell their patients the truth or not.
A. puzzle
B. perplexity
C. dilemma
D. bewilderment

4. The two most important _______ in making a cake are flour and sugar.
A. elements
B. components
C. ingredinents
D. constituents

5. The old lady has developed a _______ cough which cannot be cured completely in a short time.
A. perpetual
B. permanent
C. chronic
D. sustained

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