Phrasal verbs with "work"

This course is intended for associates working _____ Cloud certification.

I appreciate working _______ problems from different perspectives.

I’m trying to work ___ enough courage to tell it to the client. I guess he will be furious.

To revise or begin something again in order to improve it.

to end successfully, to develop or resolve as a result of hard work: ______ ___ a plan

Or, we ___ed ___ an appetite by doing yard work all day.

John's been working ___________ his Master's degree in software engineering. He has been studying a lot recently.

It works _____ that option to hire a new Senior is actually the most expensive option. How about considering hiring a Middle developer?