proof - evidence that something is true/a test or experiment that shows that something is true, proposed - suggested or put forward for consideration, protest - a strong objection(disagreement) to something/public demonstration, provided (that) - on the condition that/if, psychology - the study of the mind and behavior, public - for everyone to see or know about/belonging to or concerning the people as a whole, purpose - the reason for doing something/goal, quality - the degree of excellence of something/the standard -level- of something, question(v) - ask (someone) about something in order to get information or to test their knowledge, question(n)  - a sentence that asks for information, questionnaire - a set of questions used to gather information from people, react  - respond to something, especially in a way that is emotional or automatic, reasonable - fair and sensible, recommend - suggest that something is good or advisable, recycle  - process (waste materials) so that they can be reused, regard - have a particular opinion or attitude towards someone or something, region - a large area of land that has its own characteristics, regular - happening or done at fixed times or intervals, relevant - connected with or having a bearing on the matter at hand, reliable - able to be trusted to do what is expected, rely on/upon sb/sth - depend on someone or something for support or help, request - a polite or formal way of asking for something, research - the systematic investigation into and study of materials and sources in order to establish facts and reach new conclusions, result - something that happens or is produced as a consequence of something else, review  - to examine or consider something carefully, revise - to make changes to something in order to improve it, risk - the possibility of something bad happening, run out of - to use up all of something, rural - relating to the countryside(outside the cities), salary - a regular payment made to someone for work done,

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