Решение:
- 1. We have to move after the 9th grade.
- 2. My cousin wants to have next week. It'll be his birthday.
- 3. My friend had to change last month, so now he lives in a different area.
- 4. I don't want to disagree with my sister because we usually get on well.
- 5. Sometimes students lose at the end of the week.
Ответ: 1. move, 2. have, 3. change, 4. disagree with, 5. lose.