A sentence has been given with a blank to be filled with an appropriate word. Choose the correct alternative.

Every person should know their own _____ what their skill set is and how unique they are.

specialties

The correct word to fill in the blank is specialties.

The sentence is about the importance of knowing one's own strengths and abilities. The word "specialties" means areas of expertise or skills that someone has. It is the most appropriate option because it conveys the idea that everyone has unique skills and talents that they should be aware of.

The other options are incorrect.

• Calamities means disasters or misfortunes. It does not make sense to say that every person should know their own calamities.
• Punctualities means the quality of being on time. It does not make sense to say that every person should know their own punctualities.
• Fecundities means the ability to produce offspring in abundance. It does not make sense to say that every person should know their own fecundities.