verb
To continue doing something, especially when it is difficult or tedious
preposition
To adhere or remain attached to something
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It is important to stick at your studies in order to achieve good grades.
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I know studying can be tough, but you just have to stick at it.
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Don't give up on your goals, just stick at it and you'll get there.
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Sometimes life throws challenges at us, but we must stick at it and keep moving forward.