在他的帮助下，我取得了很大的进步，并且赶上了我的同学们。
Under his help, I made great progress and caught up with my classmates.
在他们的帮助下，我赶上了我的同学，现在我尽我最大的努力去学习以报答我的父母。
With their help, I caught up with my classmates. Now I'll try my best to study well to repay my parents.
在他的帮助下，这些同学取得了很大的进步。
With the help of him, these students have made great progress.
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