http://www.tolearnenglish.com/exercises/exercise-english-2/exercise-english-39218.php

http://www.englishclub.com/grammar/pronouns-demonstrative.htm
Do not confuse demonstrative pronouns with demonstrative adjectives. They are identical, but a demonstrative pronoun stands alone, while a demonstrative adjective qualifies a noun.

    That smells good. (demonstrative pronoun)
    That book is good. (demonstrative adjective + noun)

I strongly recommend (suggest) you read this, will certainly be good for your English:
http://grammar.yourdictionary.com/parts-of-speech/pronouns/what-is-a-demonstrative-pronoun.html

...Typically, when you use a demonstrative pronoun, you will either need to indicate what you’re talking about by pointing or otherwise gesturing toward it, or your listener(s) will need to be looking at it as well. For this reason, demonstrative pronouns are mostly used in spoken English.