1 . The students’ ______ (adopt) a positive attitude will help them learn effectively. (所给词的适当形式填空)
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2 . His not ________ (defeat) the rivals in the Youth Innovation Competition made him depressed.(所给词的适当形式填空)
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3 . Astronauts have to use tape to stick everything down while working in space to avoid everything ______ (float) off. (所给词的适当形式填空)
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4 . Miss Lin suggested us ________ (adopt) a more imaginative approach to essay writing. (所给词的适当形式填空)
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