11. The big fire that took place yesterday (cause) thousands of deaths. It's so sad.
12. Doctors are working on identifying the causes heart disease.
13. Frequent breaks may cause students (lose) their attention, which could lower their exam scores.
14. —What's the cause ① the accident? —I think he should be responsible for the accident, because his carelessness is the main reason ② it.

cause
vt. 使发生；造成；导致
cause sth 造成某事
be caused by... 由……造成
cause sb sth (= cause sth for sb) 给某人带来某事（常指不好的事）
cause sb to do sth 导致某人做某事
n. 原因；理由
the cause of ... ……的原因（强调导致某结果的事件/事物）
易混: reason 原因(解释某行为或观点背后的原因；the reason for)

11. caused
12. of
13. to lose
14. ①of ②for

15. Nanjing Museum is a modern museum and remains as one of the ( lead ) museums in China.
16. In general, men like to focus on one thing for a long time, but this can lead trouble.
17. As a ① ( lead ) of a team, you need to plan well and make good decisions quickly, or you may lead your team ② ( lose ) a game.
变形: lead vi.→led(过去式/过去分词)
→leader n.领导;领袖
→leading adj. 一流的

18. A good captain(队长) of a basketball team can inspire his teammates and take ① lead in important games. His strong spirit and excellent skills lead to ② ( win ) more matches.

15. leading
16. to
17. ①leader ②to lose
18. ①the ②winning