I语法填空（共10小题；每小题1.5分，满分15分）
阅读下面材料，在空白处填入适当的内容(1个单词)或括号内单词的正确形式。将答案填写在答题纸的相应位置
A boy quarreled with his parents and ran away from home. He had a hard life 1__ any contact with his family for years. Later he wanted to go home 2__ he was afraid that his parents might not welcome him.
Finally he decided to write a letter to his father 3__ (express) his desire to return home and begging
