Yes, you can say that! Or you can say “letter that contains advice” or “letter that provides advice.”
Them would be the correct pronoun for this sentence because books is plural and is an object, so its pronoun must be third person. The 3rd person plural pronoun in English is they, and its objective/accusative form (the form used when the item is the object of a verb) is them, so there's your answer.
His face was as red as an apple
I’m getting A or C vibes. But i’m mostly going with C.
A. uses the word correctly. The rest of the sentences make no sense. By definition, rubbish is either waste material, refuse or litter; or something criticized as being useless or worthless.