5.　　　　 The amber room was not easy to make. (2-1古迹)

4.　　　　 It is difficult to prove. (2-1古迹)

3.　　　　 The air is hard to breathe(1-3游记)

2.　　　　 Water and food was hard to get. (1-4地震)

1.　　　　 Earthquakes are very difficult to predict. (1-4地震)

9.　　　　 She tried to persuade him not to fight the government. (1-5英雄) She persuaded me to buy one(1-3游记). He persuaded the government to buy some land in the center of the city. (2-1古迹)

8.　　　　 Read the plan and suggest ways to make it better. (2-1古迹)

7.　　　　 Some people even suggest we should do more. (2-4生物)

6.　　　　 I’d like to help as the WWF suggests. (2-4生物)

5.　　　　 He insists that it belongs to his family. (2-1古迹)