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句型转换。 1. I finally work out the problem. (改为同 义 句) I work out the problem _____ _____. 2. I want to bu y a bag of rice. (对划线部分提问) _____ _____ ri ce _____ you want to buy? 3. There are many watermelons on the farm. (对划线部分提问) _____ _____ watermelons are there on the farm?