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

Solve
 
+ 
crime, crisis, difficulty, issue, problem, puzzle, question, riddle 
151.
 
Spend
 
+ 
afternoon,  amount,  day,  evening,  fortune,  hour,  life,  money,  month, 
morning, night, time, week, weekend, year 
152.
 
Spoil
 
+ 
appetite, chance, child, choice, day, fun, view 
153.
 
Stimulate
 
+ 
ability,  activity,  brain,  demand,  development,  economy,  growth, 
hormone, industry, interest, investment, research 
154.
 
Strengthen
 
+ 
ability, argument, bond, commitment, control, effort, family, force, law, 
link, muscle, position, power, presence, relationship, role, squad, tie 
155.
 
Supply
 
+ 
electricity,  energy,  equipment,  food,  gas,  goods,  information,  material, 
power, product, service, water 
156.
 
Support
 
+ 
claim, effort, family, hypothesis, idea, plan, proposal, view 
157.
 
Suppress
 
+ 
anger,  attempt,  drug,  effort,  emotion,  evidence,  rebellion,  smile,  truth, 
uprising, urge 
158.
 
Suspend
 
+ 
action, decision, duty, flight, licence, operation, order, payment, sentence 

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133 
159.
 
Sustain
 
+ 
ability, conscience, damage, effort, growth, interest, level, life, population