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19-b
20-b
21-e
22-c
23-demand
24-replaced
25-combination
26-c
27-a
28-b
57-oceans and lakes are the most beautiful sights of nature.
56-solar energy is one the most known renewable energies.
55-is a very useful thing in every society
41-c
42-b
43-a
44-b
45-It may have a sign of medical problem
38-i know electricity can be produced from water and sunlight.
39-my new system consumes less cooling energy.
29-worm
30-renewable
31-b
32-d
33-a
34-c
35-have dedicated
36-were reduced
37-if i had one million dollar i would buy expensive cars.
