You must study hard.
We should constantly urge ourselves on to study hard.
He was studying in the hope of being admitted to an engineering college
He is studying hard with a view to going to university.
We should try to learn economic theory and apply it.
He urged his students to study hard.
With some pupils, praise is not an incentive to study hard.
Your progress will urge us to work hard.
One can grasp a foreign language only if he studies hard.
They have been studying hard from the moment they enrolled.
I need to study hard. I have to practice English and Chinese more.
I will study hard, I promise.
As a student, I should have a reasonable aim, and study hard.
You can study hard and improve it.
If I had studied hard, I would have passed the exam.