They study very hard. -so they do.
他们学习十分努力。的确如此。
They must study hard because it is very important for undergraduates.
他们必须努力学习，知识对大学生来说，很重要的。
They urge me to do study hard. I am very proud of becoming a doctor in future.
他们督促我努力学习。对于以后能成为一名医生我非常自豪。
We have a happy family. Our father and mother love us very much. They work very hard. we must also study hard to become useful talents.
我们都有一个幸福的家，我们的爸爸和妈妈非常爱我们，他们工作非常辛苦，我们要努力学习。做一个有用的人。
Though they are old, but they still have a heart that is eager to get knowledge and they all study very hard, sometimes I was deeply moved by their action.
尽管他们岁数都很大了，但是他们仍然很渴望学到知识，他们都在努力学习英语，有时候他们的一些行为会让我很感动。
In our class, everybody are friendly, they also study very hard.
我们班的人都很友好，也很努力。
They study hard, I am very glad.
用刻苦学习来回报我，我很欣慰！
Our parents always said if we don't study very hard, they will send us to village to do farming.
我们家长总是说，如果你们不好好学习，就把你送到农村种地去。
Our parents always said if we don't study very hard, they will send us to village to do farming.
我们家长总是说，如果你们不好好学习，就把你送到农村种地去。
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