Задать специальный вопрос ко 2 предложению: 1. he then wrote a simple coding system, called html (hyper text markup language), to create links to files on any computer connected to the network. 2. this was possible because each file had an individual address, or url (uniform resource locator). задать вопрос к подлежащему: 3. he used a set of transfer rules, called http (hyper text transfer protocol), to link web files together across the internet. задать специальный вопрос: 4. each advance in science creates new opportunities for developing better products for everyday life. задать вопрос к подлежащему (it's относится к 4 предложению) 5. in its turn, technology provides science with new instruments for research.