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第1题

Coal is a ________ source of energy compared with other forms of energy such as oil. A. plenty B. enough
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第2题

The thirty-story building is one of the most challenging engineering projects they have ever ________ . A. undergone
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第3题

Social ________ vary from country to country. A. habits B. traditions C. customs D. manners
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第4题

Promotion is ________ upon your record of success. A. restrain B. royal C. department D. de
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