cogitate|cogitating

他喜欢在公园长椅上静坐沉思。

He enjoys sitting on the park bench to ___cogitate quietly.

我花了一整天的时间仔细思考这个复杂的问题。

I spent the whole day ___cogitating over this complex issue.

我需要一些时间静下心来仔细思考这个提议。

I need some quiet time to ___cogitate on this proposal carefully.