（福建省仙游二中09-10学年高二暑期补习测试）
People often fall ill because of me. 36 __, they can hardly blame me; it is largely their own 37 . A tired person may get 38 __, especially when he goes to crowded places with polluted air. A sudden change in 39 is another factor. In hot summer, people turn on the air-conditioner upon returning home. They will catch a cold easily.
