AS/A Level Spanish Direct and Indirect object pronouns

I am sorry for the poor review, but: 1) There aren't lots of translation practice exercises; these are the sort of examples I would use with the class, but there isn't enough for them to practise. 2) There are mistakes in some sentences used 3) The first example that talks about direct object and indirect object pronouns uses a subject pronoun instead (they) 4) Direct object pronouns seen are only in the third person, whereas for the indirect object all pronouns are introduced. Why?