The second one from left to right is the only one I'm currently plugging. Is it alright not to close the other three?

The boat hull is MAKO 86 23 feet . The boat is not currently sinking, but every 10 minutes I can hear the bilge pump pumping water (Like a jar of water) outside the boat. This is all new to me. I only know is that the second hole must be plugged before going to the water, but what are the other three for?