用所给词的适当形式填空：Five dollars _____(be)enough for this book.
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用所给词的适当形式填空：Two thirds of the students in this class _____(be) girls.
用所给词的适当形式填空：There ______(be) five silver dollars in my bag.
用所给词的适当形式填空：Either my parents or my brother_____(be) at home.
用所给词的适当形式填空：The boy, together with his parents, ______(be) visiting the museum.
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