I'm not entirely sure what you need us to do here. Do you need to write a verb that would fit the sentence? If so, do you have any options? If not, here are some verbs that would complete the sentence properly: right, undo, redress, make up for, compensate for, apologize for, etc. Hope this helps!
Answer:
i think he say
We cannot solve our problems with the same thinking we used when we created them.
He spends Christmas all alone
