Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to build forms for a curving concrete sidewalk [title] Use 12-inch (30. 5 cm) hardboard siding (sometimes called masonite) ripped down to 6-inch (15 cm) strips in 16-ft. [step] ( 4.8 meter) lengths. ( full-service lumberyards and home centers carry all this forming material.

Ending1: ) when forming shapes for curves you should hold them for the first 24 hours of construction, not longer, as they will expand the curving look while your project is underway. [title] Fill the cavities between concrete layers. Ending2: ) flex it to the desired shape of your sidewalk and stake it down. Use marking paint to mark the ground next to the form. Ending3: [title] Install concrete as follows : [substeps] Take a piece of 2x4 galvanized metal : 1.5 in. ( 2.59 cm) check the voltage to 450. Ending4: If none are home centers, those working with this material (usually pre-treated concrete) will perform this formation. [title] Build with your tires elevated off the ground.

Answer format: ending1/ending2/ending3/ending4