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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用所给词的适当形式填空：The audience______(be) clapping for over ten minutes.
用所给词的适当形式填空：Linguistics ____(be) the science of language.
用所给词的适当形式填空：The Himalayas ______(be)very famous in the world.
用所给词的适当形式填空：The secretary and principal _____(speak) at the meeting now.
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