Which of the following words contains both a prefix and a suffix? adhere
reformat
shorten
repairable

The only word with both suffix and prefix is 'Repairable'

It is because, the prefix and suffix respectively are 'Re' and 'able'

modifying the base for word

themselves

an intensive pronoun is a pronoun that ends in self or selves, such as himself, herself, themselves, yourself, ourselves. since band members is a third person plural, the correct intensive pronoun would be themselves. if the band was talked about as a collective noun, itself would be the appropriate intensive pronoun. intensive pronouns are used to add emphasis to the noun it's modifying which is why it directly follows it.