I'm not english, pleasa Complete the senteances with who, at, an, on, not, is

1. We visit our cousins the weekend
2. They have history lessons Mondays and Fridays
3. Geography is my favourtie subject
4. there a science lab at your school?
5. My mum's english teacher
6. is your best friend

1. We visit our cousins on the weekend.

2. They have history lessons on Mondays and Fridays.

3. Geography is not my favorite subject.

4. Is there a science lab at your school?

5. My mum's an english teacher.

6. Who is your best friend?

3 is blunder, i’m not sure about the last one but the first two look correct