Make your life passes, and most useful, but that doesn't mean you won't have time to have fun, it depends on the time to do the things that make your life goals.
To make your life very valuable and most useful. But that does not mean You will not have time to have fun, it is based on the division of your time to do the things that make your life toward the goal.
Make life pass you the most useful and valuable, but does not mean that. You have no time to have fun, it depends on your time to decide what makes your life towards a goal.