连词成句。

1. to, I, yesterday, went, library, the (.)

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2. eat, every, sandwich, day, a, I (.)

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3. beautiful, these, are, chopsticks (.)

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4. you, in, did, have, Beijing, fun (?)

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城市轨道交通在安全生产管埋的原则中规定的“四不放过”原则是什么？