Much to my _______,I am unable to accept your invitation.

Political parties often differ in their views on various _____ concerning their own countries.

I have to reschedule the appointment with you since there is a ________ in my plan.

 Arriving home，the boy told his parents about all the________which occurred in his dormitory.

Used to TV shows, where everything is quick and entertaining, many people do not have the _______ to read a book that requires thinking.