I'd been to public entertainments before, of course; I'd been to the cinema and the pantomime and to see my mother sing in the chorus of the White Horse Inn at the Town Hall. But that was different.
Bea asked Jill and Sam when they WOULD come back to the fair.
"Isn't" is the best option from the list in terms of completing these sentence. This is primarily because "isn't" is a contraction of the two words "is" and "not.
Insufferable is the Gothic tone it is repeated and is explained to as the narraters feelings