В каждой группе слов (или словосочетаний) три объединены общим понятием. Найдите и напишите четвертое слово, не относящееся

To be against, to arrange, to disagree, to object. To arrange.

Excuse me, pardon, happy, sorry. Happy.

Contract, agreement, treaty, invitation. Invitation. 

Pleasure, question, problem, matter. Pleasure.

Price, cost, money, sea. Sea.

To meet, to get together, to greet, to advise. To advise.