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