research - a study of a subject, to study smth. careful, significant - having special or important meaning, theory - a set of ideas that explains something, unlikely - not probable or possible, analysis - the result of the study, an examination of smth., change - to become different, critic - a person who expresses opinion about smth., dislike - a feeling of not liking smb./smth., event - a thing that happens, usually smth. important, flu - A serious disease caused by a virus, illness - the state of being physically or mentally ill, interest - attract your attention to smth., limited - not very great in amount, must - used to say that something is necessary , once - as soon as , plant - put plants or seeds in the ground to grow, professor - a university teacher, react - behave in a way as a result of smth., result - a thing that is caused because of smth else , skilled - having enough ability, expert , throw away - get rid of smth that you don`t need, urban - connected with a town or city, appear - begin to exist or be seen, characteristic - a typical quality, current - happening at present time, exactly - used to show that , focus on - give your full attention, illustrate - to make smth. clearby using examples or pictures, introduce - mention for the first time, little  - not big, not much,

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