一道英语题,求解 阅读短文,填入适当的介词

一道英语题,求解 阅读短文,填入适当的介词
Emma is a student_________Grade Seven.She always works hard ________her lessons.English is her favourite subject.She thinks that it is as useful as Chinese,but it's more difficult to learn than Chinese.______example,a lot________English words and expressions are hard to remember.She often carries her Walkman __________her,and sh spends time listening English tapes every day.It makes her listening better and better.
Emma is the best student_______ her class.She often helps her classmates_______their lessons after finishing her homework.Most_______her classmates like to ask her_______help.