Please help , 解释...

1.Are you involved with any professional affiliations?

What is this meaing? 

2.Tell me something about yourself that I didn't know from reading your resume. 
How to answer? which area is added?

3.Why are you currently unemployed?

Tell grant is end? or new head wanted reconstruction office and 3 people moved out?

4.Why have you held so many jobs in recent times?
grants were end , moved to other jobs. Is it good to say : it is school culture. We changed 4 presidents, 6-7 provost, 4 deans during 8 years.give them some background, bacause most outsite people don't know what is going on about our school.

Thanks!