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.