What's the difference between "skeptical" and "sceptical" exactly? and which is the British usage? Thank you.

"Ireland and Belgium have tried to tax plastic bags into oblivion" what does this sentence exactly mean? Actually, "tax...into oblivion" really make me confused, doesn't "oblivion" mean "something be forgot"? Thanks for all your help.

Does "take the last year off" have the meaning of " quitting school"?

玉树，永远临风而立。