Question 13. Buckingham Palace is a major tourist ____ in London. A. attract B. attraction C. attractive D. attractiveness Question 14. John asked me ____ that film the night before. A. that I saw B. had I seen C. if I had seen D. if had I seen Question 15. It gets ____ to understand what the professor has explained. A. the more difficult B. difficult more and more C. more difficult than D. more and more difficult

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