[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"external-oc-1395":3},{"payload":4,"id":7,"user":8,"level":14,"course":15,"activity":16,"activity_slug":17,"title":6,"topic":18,"tone":19,"stats":20,"created":23,"score":24,"is_favorite":25,"public":26,"is_external":25},{"text":5,"title":6},"Pollution is (0) ONE of the most serious problems facing modern cities. It affects not only the environment but also the health of people who live (1) .......... them. In many places, air quality has become so poor that residents are advised to stay indoors rather (2) .......... exercise outside during certain times of day. This is mainly because traffic, factories and heating systems give (3) .......... harmful gases into the atmosphere. Water pollution is equally worrying, as rivers and seas are often contaminated (4) .......... chemicals and waste. Governments have introduced laws to deal (5) .......... these issues, but progress is sometimes slow. Much depends (6) .......... whether businesses and individuals are willing to change their habits. For example, people can reduce pollution by using public transport instead (7) .......... driving everywhere. Cities that invest in cleaner energy and better recycling systems are likely to see improvements (8) .......... the future.","Urban Pollution",1395,{"id":9,"username":10,"first_name":11,"last_name":12,"image":13},27578,"lucia-ea8600","Lucia","Jiménez","https://api.useofenglish.ai/static/img/users/default-profile-picture.jpg","B2","Reading","Open Cloze","open-cloze","Pollution","Standard",{"times_played":21,"num_favorites":22},4,0,"2026-08-16T15:21:55",null,false,true]