3. ____________(失败) is the mother of success.

2. Many chemical ___________(工厂) are the main causes of pollution.

1. _________(面对) with difficulty, he never loses heart.

9.energy　 10. equipment 11. education　 12. expensive　 13. exists　 14. extremely　 15.eightieth　 16.eastern　 17.encouraged　 18.examined　 19.example　 20.except　 21.exhibition　 22.experiments　 23.exam　 24.enemies　 25. Electricity

　　　　　　　　　　　　　　　　 F

1. effect　 2. efforts　 3. exact　 4. engineer　 5. envelope　 6.empty　 7.especially　 8.escaped　

25.　 ________(电) ,water and gas were cut off due to the heavy storm.

答案：

24. A successful man often has many ____________(敌人).

23. The students are busy preparing for the entrance _____________(考试).

22.　 The students are going to carry out ___________(实验) in chemistry.

21.　 There will be an _________(展览) in the museum.