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

 
40.
 
Disease 
+ 
active, chronic, contagious, deadly, fatal, incurable, infectious, serious
 
41.
 
Education 
+ 
adult, bilingual, compulsory, elementary, formal, further, high, primary, 
private, public, secondary, special, vocational
 
42.
 
Effort 
+ 
astonishing,  concerted,  conscious,  considerable,  desperate,  determined, 
enormous, extensive, fruitless, good, great, joint, strenuous, tremendous, 
vigorous
 
43.
 
Element 
+ 
basic, crucial, essential, important, key, main, major, strong, various, vital
 
44.
 
Environment + 
competitive,  cultural,  current,  economic,  external,  hostile,  interactive, 
legal,  natural,  physical,  pleasant,  political,  regulatory,  social,  stable, 
threatened, urban, wild 
45.