1. Only a small minority of the mentally ill are liable to harm themselves or others. 　　A. easy 　　B. possible 　　C. likely 　　D. difficult 　　2. They have the capability to destroy the enemy in a few days. 　　A. possibility 　　B. necessity 　　C. ability 　　D. probability 　　3. Jack eventually overtook the last truck. 　　A. hit 　　B. passed 　　C. reached 　　D. led 　　4. Sometimes it is advisable to book hotels in advance. 　　A. possible 　　B. profitable 　　C. easy 　　D. wise 　　5. Obviously these people can be relied on in a crisis. 　　A. lived on 　　B. depended on 　　C. believed in 　　D. joined in 　　参考答案：1. C 2. C 3. B 4. D 5. B