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. Are you ____ duty? A. on B. of C. in D. at Ⅲ 、 用括號中適當(dāng)?shù)脑~填空。 15. She ______ ( am, is , are ) a middle school student . 16. I ______ ( am ,is , are ) from Beijing . 17. Mary and Grace _______ ( am , is , are ) good friends . 18. There _______ ( am , is , are ) a pen in my pencil case . 19. There _______ ( am , is , are ) some apples on the table . Ⅳ 、 根據(jù)上下文完成句子。 20. A: Where is Mary’s English book ? B: _______ it on her desk ? A: No . I can’t ______ it . B: Oh , look ! ________