Answer:
The main message of this excerpt is instint.
I believe the message is that, as well as dogs have his own instints (searching for food when they are starving, and fighting until death in order to get food), humans are not different, they will defend theirselves and their possessions until death. This situation does not mean that even when humans are acting because of his instints, they do not feel fear: when Bill says "I wisht they'd strike game somewheres, an' go away an' leave us alone." it means that they know they have to do something to make dogs go away even they do not like the situation and feel afraid, as well as dogs do but have no other option to survive than to follow their instints.
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Explanation:
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25. 29
26. with $1 million USD
27. Recognize
28. 20,000
29. use English in daily conversations
30. professional development of colleagues
31. Equip local schools
32. Fund student travel