根据含义提示完成句子.

1. 我听到那个有趣的故事,禁不住笑了.

    I ______ _____ ____ when I heard the funny story.

2. 你对我的朋友有兴趣吗?

    Do you _______ ______ ______ in my friends?

3. 想想吸烟对健康的影响,你就不会再抽烟了.

    Thinking about the bad effect on health you won't _____ _____ smoking.

4. 对他的无理要求我不会让步的.

    I'll never _______ _______ ______ his unreasonable demands.

5. 他们请他走人,也就是说,他被解雇了.

    They asked him to leave, _______ _____ ______, he was fired.