Please choose the correct ending to complete the given sentence: Home and Garden: [header] How to tell if you have fixed a gas leak [title] Notice if you smell gas. [step] The smell of gas is one of the best indications that you haven't successfully fixed a gas leak. While you might not always be able to smell a leak, you should pay attention to see if you do notice the smell of leaking gas.

Ending1: [substeps] If you notice a foul odor, you should see a doctor to get tested for it. You could also have one of the following: if you've heard or smelling a pipe leak while you're in or out of work, it is likely that it's gas. Ending2: [substeps] Gas smells like sulphur or " rotten eggs. " the smell of gas is made by mercaptan, an additive that is intended to help humans smell it. Ending3: [substeps] If you smell gas, then you may have a gas leak. [title] Check if you see gas coming from nearby buildings. Ending4: For example, you might smell gas when you run the dryer. Some people also experience gas as a result of being emotional.

Answer format: ending1/ending2/ending3/ending4