4th stage interview - not sure what to ask

Hey all,

I have been in the process of applying for a rather small WM company in the UK (£50b - $61b AUM) within their strategy department which overlooks the buying side of M&As and other aspects of the business such as expansions, operations, tech etc.  (I'm a fresh grad with odd job selections on my CV that is pursuing a career in finance.)

I had a first-round interview with two team managers that included behavioural and technical questions about how I would use strategy to do this or that, that was relevant to their present strategic goals. I had to create a PowerPoint presentation for them in round 2. The third round consisted of two senior managers, one of whom was a chief staff member, making the questions quicker and more tough, but surprisingly no technical questions. 

Since the same staff members weren't present for the first three interviews, I was able to use the same questions for all of them. However, now that I've been invited to another round where they want to "assess team fit" and for me to get to know the team as a whole, I'm not sure what questions to ask because I don't need any more information from them.

Could anyone offer advice on how to approach this or what questions I should be posing?

Thanks a lot!