检查一下几个句子是否有语法错误,如果有请改正
Our mission statement is to enrich our after classes life while we just spend less money to enjoy more fun.
We aim at providing a comfortable place and a convenient way for students to have fun and buy magazines.
Our first goal is to earn back our cost and make a profit in a year.
The second goal is to make students around us to keep focusing on our shop services and introduce our shop to more new customers.
The third goal is to attract some new sponsors who want to put advertisements in our shop.
the fourth goal is to open chain shops.
The fourth goal is to open chain shops.