How to say"专心地做一件事"in English?

问题描述：

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intent upon doing sth
对某事专心致志;一心一意要做某事

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2L的是get down to doing吧?

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concentrate on sth!
focus on sth!

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get down to do sth

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bend one's mind to sth /doing sth 专心于某事/做某事

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lost in sth.
指做某事非常的专心，已经陷入其中

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Do sth. with with heart and soul

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do one thing attentively
attentively是专心致志地

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to be absorbed in
to keep (or fix) one's mind on;
to concentrate one's attention;
to bend one's mind to;
to give one's mind to
lost in doing

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我觉得2楼的正确点