some thing that means lot to you of yours that you have had for many years.
it is called chemistry
Many people made valuable contributions toward navigation
Things in your home that are valuable to you.
True
The art of engineering and made valuable contributions as trainers and leaders.
Most Valuable Player Most Valuable Professional
Arguably, Mahatma Gandhi's most valuable contribution to society was not the independence of India, since that would have come sooner or later anyway. His most valuable contributions were the demonstration of people power and that passive resistance works.
If by "this service" you mean FAQ Farm, then yes, it is very valuable.
It does not mean valuable.
That depends a lot on who you mean by "they".
how much effort you but into your work.
Valuable land is a piece of property that is a source to the townspeople. In other words valuable land is land worth protecting.