Ответ:
1. Who is your class teacher?
Miss Omarova.
2. What subject do you like best at school?
I like biology.
3. Why do you like this subject best?
Because I am interested in animals.
4. How do you get to school?
I take a bus.
5. What do you eat for lunch?
I usually have a school lunch.
6. Where do you go during break time?
I go to the playground with my friends.
7. When do you do sports at your school?
We do sports on Wednesday afternoon.
Если нужно вставить все слова из скобок, тогда "Which", думаю, будет лучше вставить во 2-ой вопрос. Хотя, там больше подходит "What", как и в 5-м вопросе.