Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to prepare used cooking oil for biodiesel [title] Obtain used cooking oil. [step] Locate a source for vegetable oil that has been used in cooking. Contact local fast food restaurants, cafeterias, hotels and other commercial food establishments to see if you can take their waste oil, or pay a very small fee for it.

Ending1: Make sure the oil does not fit your state standards for storage. [substeps] Understand that if you can't-and you must or cannot-use the oil for cooking, contact local quick food stores and restaurants to see if you can take it. Ending2: [title] Purchase used cooking oil online through watercrafts. [step] Watercrafts sells cheap, straightforward bottles of cooking oil. Ending3: Read the address regarding their waste oil use policy in the organization's website, or call the customer service number provided by one of the restaurants to see how to find out if there is any trade-off policies. Then, pay a higher fee for the oil. Ending4: You may compete with rendering companies, who also pay restaurants to take used oil off their hands. [substeps] Try a restaurant that sells a lot of fried food, like french fries or fried chicken, as they are very likely to have large quantities of used oil that they need to dispose of.

Answer format: ending1/ending2/ending3/ending4