Sentence:  It contained , for example , a number of curious admissions about the peasants , who enjoy no sickness benefits , no old-age pensions , no paid holidays ; they still benefit far less than the `` other '' 50 per cent of the nation from that `` welfare state '' which the Soviet Union so greatly prides itself on <WSD>being</WSD> . 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)