Решение:
Нужно выбрать правильное предлоги из списка: of, with, at, about.
- I think Sam likes Ann. He always looks at her.
- John is a good brother. He always thinks about his little sister.
- I can't go to the party because of my homework.
- I live with my mum and dad.
Ответ: 1. at, 2. about, 3. of, 4. with