Please choose the correct ending to complete the given sentence: Laying tile: A construction worker uses a handheld scraper to apply plaster to the bare floor. A worker places tiles onto the floor and uses plastic cross spacers in the groves. a heavy weight roller

Ending1: blows a patch of plaster out onto the floor. Ending2: rises from the floor an sets off sparks around the plaster. Ending3: is placed on the floor and the roller is pushed apart with an elastic and strap. Ending4: is rolled over the newly placed tiles.

Answer format: ending1/ending2/ending3/ending4