---Who is the tallest boy? ---It ______ be John. John is of medium height.A．mustB．needn’tC．mightD．ca

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• It _____ that Yu Mei has changed a lot. [ ]A. seem B. seems C. look D seemed-八年级英语
• A ruler and a pen ________ in the Lost and Found. [ ]A. is B. are C. has D. have -七年级英语
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• ----- Can you ride a horse? --------No, I ________.A．needn’tB．may notC．can’tD．mustn’t-九年级英语
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• —Where is Tom?—He hasn't come to school today.I think hebe ill.[ ]A. has toB. shouldC. mayD. ne
• Look! Grandma with her grandsonsplaying happily in the garden now. [ ]A. are B. is C. was D. were -八
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• 如图是草原生态系的食物网，请据图回答．（l）一个完整的草原生态系统，除了图中所示的各种生物外，还应包括______．（2）此生态系统中的生产者是______，它与消费者之间形成_____-生物
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