long cylindrical things such as glasses of drink, pairs of jeans, pens or trains and buses / films or TV shows / home runs or goals / rounds of a match in boxing, wrestling or judo

current, this, the matter in question / original, actual, base

book / this / main / real / actual / true

what

let's see; what have we got here

Nothing

which (of three or more) / which one /

when

when

at any time