Please choose the correct ending to complete the given sentence: Health: [header] How to make a car air freshener [title] Assemble the items needed for this project. [step] These are listed below under " things you'll need ". In particular, use recyclable items to make this as sustainable a project as possible.

Ending1: Also assemble all your tools including non-recyclable items such as adhesives and silica gel capsules. [title] Press and twist the sides of each spring pistics pieces together tightly with your hands. Ending2: [title] Find a hollowed out envelope to use as the place for the air freshener. [step] Know where the fill and seal is located in the envelope. Ending3: [title] Spray a large-mouthed spray bottle with clean, easily cleaned water. [step] Fill the bottle with the wd-40 solution or process your own. Ending4: [title] Design the template for the air freshener. [step] Typical designs include tree shapes or state, province or country shapes, food shapes, etc.

Answer format: ending1/ending2/ending3/ending4