I would like to say that a someone cannot leave something because he/she benefits from this something a lot. He/She mainly depends on them. What is the best word that describes it? Should I say "discontinue" or "do without" or something else?
Humanity cannot do without technology.
A father cannot do without his son. He really loves him.
I can not do without my necklace. It's a gift from my best friend.
Is the expression "Do without" okay in those examples? Or should I use another idiom or word?