Ответ:

После предлогов и глаголов нужны объектные формы местоимений:
  1. I’ve got a little brother. I watch cartoons with him every evening.
  2. Educational programmes are great. I learn a lot from them.
  3. I don’t like that new TV series. I don’t like it.
  4. Who watches us?
  5. My sister likes talk shows. I don’t watch them very often.
  6. My brother likes football matches. I don’t watch them very often.

Ответ: 1 — him, 2 — them, 3 — it, 4 — us, 5 — them, 6 — them.