Воткните предлоги I took your bag instead of mine __ mistake.They

Воткните предлоги I took your bag instead of mine __ mistake.
They went __ a ten-kilometre hike.
Paula suffers __ a bad headache.
Can I put __ some posters?
Marathon runners want to raise money __ charity.
We sat __ the campfire.
Adam is responsible __ making banners.
I think you are mistaking me __ someone else.
I cooked some sausages __ the barbecue.
Why don't we gather and clean __ the pond?

Пожалуйста!! Ответьте... ,_, У меня завтра олимпиада.