Sentence:  Usually she marked the few who did thank you , you did n't get that kind much in a place like this : and she played a little game with herself , seeing how downright rude she could <WSD>act</WSD> to the others , before they 'd take offense , threaten to call the manager . 
Meaning of the word marked with <WSD> tags:  behave in a certain manner; show a certain behavior; conduct or comport oneself