Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to grout wall tile [title] Put on safety protection. [step] Use rubber gloves, eye protection, and a smock. If you don't put on safety protection, you could potentially hurt yourself.

Ending1: Step into a small container, coat in petroleum based, brown goo, or other commercial-grade product; and tap the container against a nearby surface to knock out grout. [title] Test grout on a level surface. Ending2: If your grout doesn't stop there, the tile may accidentally break down. [substeps] Use the wall grout drops to prevent losing adhesion in the shower with the tile. Ending3: This is especially true for eye protection, as you may get grout in your eyes without it. [substeps] Make sure the room you're working in is properly ventilated. Ending4: This is because grout can cause serious damage to the walls, and you should keep that in mind as you begin to grout tile tiles. [substeps] Remember that you can grout concrete slabs without any knives, forks, and roller blades.

Answer format: ending1/ending2/ending3/ending4