It is not right to make a promise unless one is sure he can fulfill the promise.
This sentence contains one main and two subordinate clauses.
The main clause is <em>It is not right to make a promise, </em>and the two subordinate clauses are <em>unless one is sure </em>and <em>he can fulfill the promise.</em>
Maybe you should ask some real English questions .-.
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:
The answer is D because I did this stuff last semester and I passed it with a 89