Нужны имена твоих одноклассников. Можешь потом подставить вместо моих. Например:
1)I think Sasha will be a doctor.
2) I think Dasha will be a dentist.
3)зависит от пола одноклассника : I think Dima/Natasha will be a businessman/businesswoman.
4) I think Liz will be a shop-assistant.
5)I think Misha will be a worker.
6)I think Roma will be a farmer.
7) I think Elisa will be a teacher.
8) I think Lena will be a cook.
9)I think Pavel will be a driver.