Sentence:  Imagine a country where children do nothing but play until they start compulsory schooling at age seven. Then, without exception, they attend comprehensives until the age of 16....Children <WSD>address</WSD> teachers by their first names. Even 15-year-olds do no more than 30 minutes' homework a night. 
Meaning of the word marked with <WSD> tags:  To direct speech to; to make a communication to, whether spoken or written; to apply to by words, as by a speech, petition, etc., to speak to; to accost.