Answer:
10. Je lui parle.
11. Nous te donnons les cadeaux. or Nous les te donnons.
12. Il lui prête un crayon.
13. Il leur téléphone.
Step-by-step explanation:
11, Technically te replaces toi, another pronoun used as the object of the preposition, à . There is no indirect object noun in the original sentence.
Cadeaux is the only noun in the sentence; it is a direct object.
(Maybe you get extra points for pointing that out to your teacher, if you ask the question about it in the most polite way you know.)