to keep at it (to continue/persevere with something difficult)

Eg 1:

A: I’m thinking about quitting college. I can’t manage all the work.

B: I know it is hard, but you have to keep at it. It will get easier.

Eg 2:

A: How did you become so good at speaking English?

B: I just kept at it. Even when it became really difficult and I couldn’t understand my teacher, I just kept at it.

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Can you make a sentence using to keep at it?