Ответ:

7)Alec said (that) his friend lived in Moscow.

8)The poor man said that his horse was wild and it could kill my horse.

9)The teacher said that I hadn't done my work well.

10)My classmate said that he couldn't explain me this rule.

11)He said that he had received letter from his uncle.

12)I said that I could give her/him my adress.