根据句子意思和所给首字母或中文提示，在标有题号的横线上写出一个英语单词的完整、正确形式，使句意通顺。
He has developed his f____________ in English from his childhood and now he can communicate freely with natives from English-speaking countries.
As most of the population in China are farmers, a____________ plays an important part.
In order to reduce the toll of death and disease from tobacco, they have r____________ its production.
This is an e____________ tough task, but I think you can fulfill it.
At the news of Qian Xuesheng's death, the whole n____________ was in deep sorrow.
It was their wisdom and ____________ (勇气) that helped them win over the hardship.
They are hardworking and ____________ (因此) they have done a good job.
____________（逐渐地）, the children began to understand.
Tom o____________ (欠) me 500 Yuan.
I persuaded my mother to buy me a/an ____________ (便携的，手提的) computer.