Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to make pop bottle biodiesel [title] Obtain the necessary ingredients listed below. [title] Work outdoors in an open space. [step] There must be adequate ventilation.

Ending1: Be sure you have at least some shade, even if it's wet or raining. Don't rub your face if possible; water will do the work, though. Ending2: In general the temperature of the air must be above 99.8 ° f (−35 ° c) and higher than the temperature of the sun. [title] Form a " v " shape with your foot. Ending3: Take proper precautions, such as wearing gloves and protective eyewear. And use the same precautions listed on the labels of the ingredients, in addition to your common sense. Ending4: [title] Reduce the use of pesticides by 20 %. [title] Place the entire bottle in water using a lab hose, bucket, or other device.

Answer format: ending1/ending2/ending3/ending4