When you have a post office box， the postman does not bring letters to you， but you have to go to the ___1___ and get your letters from your box. The box is locked， and only you have the key， so the letters are quite ___2___.
1. A. schoolB. post officeC. station D. postman
2. A. strongB. good C. safe D. long
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答案：从语法上看，各选项都可以填入空格。众所周知，信件要通过邮局收发，在邮局开了信箱就得到邮局去取信件，第 1 题选 B;开信箱的钥匙保持在主人手里，只有主人才能打开信箱，信件当然十分安全。根据这一常识就能锁定第 2 题的正确答案为 C。