Hit the ceiling => Become very angry i.e. My GF hit the ceiling when she found out about my betrayal. Turn sb off => Disgust someone i.e. She disgusted him when he tried to talk with his mouth full.

Hard work is a universally recognized pre-requisite for success in any endeavor incl. Language Learning. Thomas A. Edison once said: "There is no substitute for hard work!" :)

I think the challenge behind this question is anything but one of despair, which can lead us into absurdity... So better deal with it through realism and philosophical reasoning, or we may all end up with hopelessness in life...

"Collaboration" requires leadership and is done with an enemy country. i.e.: ~~They collaborated with the enemy => Enemy country ~~They collaborated on the project => Leadership in teaming up whereas … "Cooperation" is only the process of working or acting together. ~~They cooperate with our organisation => Work/Assist

Good question! It is our absolute right to question about it sometimes... Well, "Life" means the union of your soul and body. Life is a day to day struggle, so I like to think it's worth living - just learn from yesterday, live for today, and be hopeful for tomorrow. The important thing is not to lose hope in life :) Good luck!

Thanks to Eliot, Josef & Carmeyl! And thanks to Josef again for your comment by specifying an example, though my BS is in Biology, but well, right, lets consider your example... anyone here to be able of making any wise suggestion? The important issue is yet the matter of choosing one over the other