Please choose the correct ending to complete the given sentence: Work World: [header] How to survive marine boot camp [title] Learn to swim before boot camp if you don't know how. [step] You will most likely wash out of boot camp if you can't swim. Passing a swimming exam is a major part of getting through boot camp.

Ending1: Every time you do dolphin-related difficulties on land, or think you may be sick, your brain releases a virus called photophobia (fatigue) and photophobia, and your brain is able to resist them, which inspires race and enthusiasm. [substeps] If you swim too soon in boot camp, a fear of fluid loss increases from time to time. Ending2: Before bootcamp, you will need to learn how to swim. Learning how to swim is essential, particularly for those who're competitive, since you don't know what they're getting themselves. Ending3: Though they will send you through remedial training if you don't pass the first time, make it easier on yourself by learning to swim before camp. [substeps] Washing out means you fail your training and aren't advanced into the marines. Ending4: Learning how to swim in a pool before boot camp will open new opportunities for life in the open, and will give you something to look forward to. [substeps] Stay in the water for a while if you can.

Answer format: ending1/ending2/ending3/ending4