I always want to raise a cat, 
我一直想养一只猫,

but my parents don’t allow me to do it, 
但是我的父母不允许我这样做

because they think I can’t take care of the cat,
因为他们认为我不能照顾猫

what’s more, they are busy and have less time to look after it.
更重要的是,他们很忙,没有太多时间照顾它。

In order to prove that I can take the responsibility, 
为了证明我可以负责,

I

help my mother to do the housework and I try to be independent. 
我帮助妈妈做家务,尝试变得独立。

My parents are happy to see me become mature,
我父母很高兴看到我变得成熟,

at last, they agree to allow to raise a cat. 
最后,他们同意去养一只猫。

I am so happy, 
我很高兴,

it is my job to look after it. 
照顾它是我的工作。

When my parents are not at home, 
当我父母不在家时,

the cat companies me, 
小猫陪伴着我,

she is one of my family members. 
她是我的家人。