10.The police are still uncertain of the murderer's 　　 　　 (身份).

答案:1.official　2.based　3.vocabulary　4.actually　5.frequent　6.gradual　7.voyage　8.fluently　9.latter　10.identity

Ⅲ.完成句子

1.　　　　　　　　　　　 　　　　 (因为河水被污染),the fish in the river disappeared.

2.The view of Hukou Waterfall on Yellow River is so spectacular that it attracts lots of tourists to 　　　　　　　　　　　　　　 (走上前去仔细观赏它).

3.Good knowledge should 　　　　　　　　　　　　 (用来帮助我们) achieve great success.

4.The news was entirely 　　　　　　　　　　 (以事实为基础的), so it was convincing.

5.Helen told us that she would give it another try 　　　　　　　　　　　　 (即使她可能再次失败).

技能提升 Ⅰ.用所给单词的适当形式填空