You should always believe that if you keep working hard, you will have a promising future.

你要坚信，只要你不断努力就能有一个光明的未来。

youdao

Keep working hard, and you will achieve success.

继续努力，你就会成功的。

youdao

He would keep working hard on something for many hours till midnight.

他会为一件事情奋战数个小时，直至午夜。

youdao

Keep it up! You are working really hard. You are such a great worker.

再接再厉哦。你做得真不错。真是个努力的学生！

I'm glad 课堂 - SpeakingMax英语口语达人

Keep it up! I know you can do it. You're working very hard.

再接再厉哦！相信你行的。你学得非常努力。

It depends on 课堂 - SpeakingMax英语口语达人

Just got to keep battling and keep working hard.

WSJ: Strasburg outpitched by Harvey, Nats lose to Mets

And we need to keep our nose to the grindstone and keep working hard to continue that growth and continue that job creation.

WHITEHOUSE: Press Briefing

And keep working hard, keep paying attention, because your teachers know more than you do.

WHITEHOUSE: President Obama Reads to Schoolchildren