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1 . She returned home, ________ (carry) a lot of books. (所给词的适当形式填空)
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2 . ________ (hear) the bell, the students enter the classroom. (所给词的适当形式填空)
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3 . Four people entered the room ________ (look) around in a curious way. (所给词的适当形式填空)
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