根据句意及首字母提示在横线处填上恰当的单词,使句子意思完整,语法正确。

1.  U________you tell me the truth.I won't help you.

2.  The b ook is very educational,  and it has a great i________on his life.

3.  I suddenly r_______how important it was.

4.  We hope the f________between two countries will last long.

5. With the d______of science, people can do many jobs easily.

6.  The world's population is one of the biggest c_______of the world today.

7.  I think s_________English is more difficult than wriltcn English.