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

 
16.
 
Comfortable  + 
bed,  chair,  clothes,  home,  hotel,  lead,  life,  lifestyle,  lounge,  place, 
position, restaurant, retirement, room, victory, win
 
17.
 
Complex 
+ 
issue, problem, process, relationship, structure, system
 
18.
 
Complicated  + 
case, matter, process, relationship, structure, system
 
19.
 
Considerable + 
advantage, amount, attention, effort, experience, improvement, influence, 
pressure, progress
 
20.
 
Contemporary 
+ 
art,  artist,  culture,  dance,  history,  issue,  music,  society,  world, 
writer
 
21.
 
Controversial + 
book, broadcast, circumstance, issue, matter, policy, subject, topic
 
22.
 
Conventional + 
approach, means, medicine, method, treatment, view