请帮我修改下列文字中的词语与语法错误.
问题描述：
请帮我修改下列文字中的词语与语法错误.
China our homeland,in the large land have a lot of poor man ,a lot of pain man ,we must work hard!we must make they
be rich and happy .
I love the people, my livelihoodall is the people give me,we must work hard in my lift time the people .and make more people chang rich and happy.
答
China,our homeland,within its large territory there are a lot of poor and pain men,so we must work hard!We must make them to be rich and happy.
I love the people,and my whole livelihood is given by them.So I must work hard during my life time for the people and make more of them to becoem rich and happy.