Today，the world wide web can be used both to search information and to make it 【C1】______to others.Information 【C2】______on webpages is viewed by 【C3】______of browser.The sources of information linked in this way can be located on any computer 【C4】______is also part of the web.Each information source may be linked to an 【C5】______number of other webpages.Hypertext and hyper-links allow users 【C6】______as receivers of in-formation to 【C7】______from one source of in-formation to another，deciding for themselves which information they wish to 【C8】______.to their browser and which links they want to 【C9】______The addresses of 【C10】______can be found by using the hundreds of search engines Which provide 【C11】______to databases which hold information on them.Once a webpage has been found，hyperlinks may point 【C12】______other places of interest on the web.Addresses of webpages also appear in other more 【C13】______media，such as magazines，newspapers and television programs，and on posters.Webpages，in their 【C14】______facilitate access to information made available by other 【C15】______of media，for example，collections held in libraries.Most webpages offer interactive opportunities which go 【C16】______merely allowing visitors freedom as to when and how they visit a page.【C17】______can be kept formal via a questionnaire which can be filled 【C18】______，or informal by providing an address for e-mail or even by installing a digital guest book for comments left for other users to read.【C19】______all web-pages are protected so that unauthorized visitors cannot make unsolicited changes to them，it is also possible to 【C20】______access to pages on the internet to those holding a password.

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