The leaders of almost all major countries and cities, even 'these' (nie, to jest zle slowo, daj tutaj 'those') poor and less developed, 'aplly' (blad ortog.) for the opportunity of hosting these events. There are many disadvantages as well as advantages (ale czego? musisz to napisac) .
First of all, to host a major sporting event the city or a state gets a chance 'to' (zle slowo, tutaj 'of') development and 'gain' (dokoncz slowo) popularity. During the preparation, 'is being developed transport' (zla kol slow, prosze nie uzywaj kiepskich translatorow i nie tlumacz slowo w slowo z polskiego - bo sie wtedy wsciekne), tourism and services industry. Moreover, 'may be created many new workplaces' (znowu to samo - nie rob tego) and reduce the unemployment rate. Last (przecinek przed but) but not least international sporting events are (a gdzie przedimek?) unique attraction for local people. They will be delighted, if they do not to leave the country to see 'that' (ale co? musisz napisac) .
On the other hand, it is certain that as a result of hosting (przedimek) big sporting event local people have to put up with many inconveniences. First of all, (przedimek) arrival of many people who want to see (przedimek) event 'created' (zle slowo) traffic jams, noise and air pollution. Moreover, for the duration of (przedimek) championships 'increase the prices of products' (po jakiemu to jest?) in many local stores. Secondly, research shows that in locations hosting international sports events there is (przedimek) high rate of crime, which in turn reduces the level of security (ale dla kogo? ). Finally, despite 'of' (zle slowo) financial support from the organizers, 'preaperings' (zle slowo) for the event 'require' (zle slowo) 'the' (zle slowo) huge financial contribution from 'the budget.' (tak, tak, ale musisz napisac ze ten budget nie jest ani twoj ani moj)
To sum up, there are many pros and cons of big sports events organization and the decision to 'apply' (do kogo? musisz napisac) should be carefully thought out.
Zrob cos z tymi przedimkami (a, an, the). Prosze nie tlumaczyc slowo w slowo z jez. polskiego - prosze nauczys sie w jaki sposob zdania w jez. ang. sa formulowane.