What are examples of abstract nouns in sentences using the words country's nieces its theirs hers witnesses' and library?

Example sentences (abstract nouns in bold):

• This country's chief religion is Christianity.
• I'm planning a vacation for my nieces.
• We have an appointment to get the puppy itsimmunizations.
• The idea was theirs.
• My experience is limited but I have confidence in hers.
• I admire the witnesses' courage, they may be putting themselves in danger.
• I found the information at the library.