英语短文改错,

题目

英语短文改错,
In order to make the best of learning materials,the Students ’Union of our school is planning an activity.The school-leavers are called on to give away our used books,newspapers or magazines to the student in the lower graders.The idea,that is intended to promote friendship and encourage a low-carbon lifestyle,are highly praised and supported by the teachers and students alike.The activity will be hold on the first floor of the school library and so it will last eleven days.

答案

第一行：正确
第二行：our改为their
第三行：student改为students,graders改为grades,that改为which
第四行：are改为is
第五行：hold改为held