470. Riches + plural verb
(X) All her riches was stolen.
(O) All her riches were stolen.
Note: "Riches" is a plural noun and always takes a plural verb.
471. Wages + plural verb
(X) Keith complains that his wage is low.
(O) Keith complains that his wages are low.
Note: "Wages" is a plural noun and takes a plural verb.
472. Billiards + singular verb
(X) Billiard is a very difficult game.
(O) Billiards is a very difficult game.
Note: Billiards, draughts[= checkers], darts are always plural, but are followed by verbs in the singular.