You had to say whether or not the underlined word was adjective or pronoun. Can you check?

-That- is my favorite fiction book.
-That- is a pronoun.

-This- is a good collection of books, too.
-This- is a pronoun.

-These- are good to read.
-These- is a pronoun.

Right again! See, these aren't so hard -- with enough practice. <g>

Actually, in the sentences you provided, the underlined word "that," "this," and "these" are not pronouns but demonstrative adjectives.

A pronoun is a word that is used in place of a noun, whereas a demonstrative adjective is used to point out or indicate a specific person, thing, or group. In the sentences you provided, "that," "this," and "these" are being used to point out or indicate certain books, which means they are functioning as adjectives.

So, to answer your question, the underlined words in the sentences you provided are all adjectives, not pronouns.