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13. ______ will it take to get the patent? A. How long B. How far C. How much D. How many
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12. I find that a good advertisement always _____ to the success of a product. A. attributes B. contributes C. belongs D. comes
11. Owing to the sore throat, he had difficulty ______ loudly in public. A. spoken B. to speak C. speaking D. spoke
10. ______ is known to the world, Mark Twain is a great American writer. A. That B. Which C. As D. It
9. Jenny is learning Japanese. _______ her brother. A. So is B. So does C. Nor is D. Nor does
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