Acronym Soup: CV ?

Questions

[pot luck] until the 1960's which monks spent their lives in perpetual silence?

[pot luck] the root of which garden weed is sometimes used as a coffee substitute?

[pot luck] what are cumulus, cirrus and stratos?

[pot luck] what was the nickname of the world war 1 german flying ace?

[pot luck] who originally said 'please dont shoot the pianist hes doing his best'?