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

preliminary 
investigation is 
imperative.
 
Based on the above-mentioned facts, one can conclude that the Moon landing greatly impacts on distant 
future, although its effect is not apparent 
for the time being. 
The Moon is the eventual 
gateway 
to other 
planets and potentially the place of residence for the future generations. The scientific knowledge and 
economic benefits to be gained by building a sustainable Moon base are huge. 
1.
 
feat = achievement = accomplishment 
2.
 
relevance = significance = importance = weight 
3.
 
explicit = overt 
4.
 
observe = watch = monitor 
5.
 
unravel = find an answer to = work out 
6.
 
unknown mysterious = unfamiliar 
7.
 
feasible = practicable = viable = practical = realistic 
8.
 
obtainable = available = accessible 
9.
 
preliminary = initial = preceding 
10.
imperative = necessary = essential = crucial = vital 
11.
for the time being = for now = for the moment 
12.
gateway = entry = doorway = access 

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10 
Topic  10:  Some  people  argue  that  the  government  should  spend  money  on public  services  and