1. In order to arrive there early, we must depart early.
2. A. The house is on fire.
3. Our school's library is not too big, but there are many books in it. When entering the library, students must follow these rules: do not bring backpacks into the library; keep quiet when reading; may borrow four books at a time but cannot lend the books to someone else; return books on time; leave the library before 6 pm because the library will be closed.
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