A number of theories have been proposed to explain the situation.

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His shoes were shined to perfection.

A A:cleared B B:polished C C:washed D D:mended

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She can be relied on in a crisis.

A A:looked after B B:believed in C C:turned on D D:depended on

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Marshaconfessed that she knew nothing of computer.

A A:admitted B B:reported C C:hoped D D:answered

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The test produced disappointing results.

A A:unsatisfactory B B:indirect C C:similar D D:positive

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My doctor said I should vary my diet more.

A A:change B B:prepare C C:cook D D:choose

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Greene spent a brief time at Cambridge.

A A:hard B B:good C C:short D D:long

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The book took ten years of thorough research.

A A:basic B B:careful C C:social D D:major

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The high-speed trains can have a major impact on our lives.

A A:effort B B:problem C C:influence D D:concern

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The love of money is the root of all evil.

A A:result B B:end C C:cause D D:force

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We explored the possibility of expansion at the conference.

A A:offered B B:investigated C C:included D D:accepted

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