按要求完成句子。
1. this, is, ruler, a (?) (连词成句)
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2. is, that, your, skirt (.)(连词成句)
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3. isn’t, this, case, pencil, your (.)(连词成句)
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4. is, box, your, lunch, where (?)(连词成句)
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5. Is this your book? (做否定回答)
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