1. He____the difficulty of the work.
    他使我确信这件工作的艰巨性.
2. I try to____get rid of the danger at once.
    我试图说服他立刻摆脱危险.
3. He tried to________they travel by airplane is quite safe.
    他尽力使他们相信乘飞机旅行是安全的.
4. He________it's no use trying to convince them.
    他坚信试图说服他们是没有用的.
5. You are a teacher of him, so you'd better____ quit smoking.
    你是他老师,你应该劝说他放弃吸烟.