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词类转换 根据所给词汇,填入一个正确的形式。 1. Edison kept _______ out his new idea.(try) 2. Do you think the computer today is _______ inventions?(useful) 3. I saw a boy ________ on the railway tracks near the station.(play) 4. I want to learn how to run quickly and to eat _______.(health) 5. She speaks too quietly.Tell her ______ a little louder.(speak)