Topic 1: Increasing travels between countries enable people to learn different cultures or to increase tension between people from different countries

Relevant + data, document, experience, fact, factor, information, material, qualification

Reliable + data, estimate, evidence, guide, indicator, information, means, measure, method, result, source, way

Remarkable + achievement, change, coincidence, discovery, effect, fact, feat, feature, humour, improvement, man, performance, similarity, success, tolerance, woman

Reverse + direction, effect, order, process, situation

Rural + area, community, development, district, economy, environment, landscape, people, population, society

Serious + accident, attempt, attention, blow, business, challenge, concern, consequence, consideration, crime, damage, danger, doubt, effect, error, flaw, harm, illness, injury, issue, matter, offence, problem, question, risk, thought, threat, trouble

Social + background, behaviour, benefit, change, class, contact context, development, event, group, interaction, issue, justice, life, order, policy, problem, relationship, responsibility, skill, status, welfare