Поставьте нужный предлог(as,at,for,in,on,to,with)

In the texts the letters PC stand ____the expression “personal computer”. Jane offered us her services ___a nurse long ago, and since that time she has been serving ___our health centre. It was rude ___her to mention my defeat. ___their shame they had no information about Mr Johnson’s services. Terrorism is real threat ___modern society.