Question

you are going to a room to change the bed linens and you drop the sheet on 2 points
pick it up and use it to change the bed
put in the soiled laundry
leave it on the floor
tell the housekeeper

Explanation:

When a sheet is dropped on the floor, it may have picked up dirt and germs. Using it as is (picking it up and using it to change the bed) can transfer those to the bed. Leaving it on the floor is untidy and a safety hazard (someone could trip). Telling the housekeeper might be an option but the most immediate and correct action based on hygiene and standard laundry - handling procedures is to put it in the soiled laundry. Soiled laundry is meant for items that are no longer clean and need proper washing.

Answer:

put in the soiled laundry