1.Since then,we have lived far away from each other and haven't met each other again.（抱歉,我“天各一方”不知道如何精准的翻译了.）
2.I don't want to get you involved in the problem on my wokk.
（‘get sb.involved’是一个非常有用的短语.这里因为‘involve’与‘s.b’构成动宾关系,所以用‘involved’.）
3.The company is too small to compete with those blg companies.
('too…to' 是"太……以至于不能……"的意思,可用 ‘so…that…’来改写为同义句）
4.My parents are always very strict with me,because I'm their only child.
祝学些进步!