Are the word choices definitive for the following with the given definition? 1. Texas ________ Mexico on its southern border. - to border upon 2. Staring down the ______ of the mine shaft we were uncertain of how deep it really was. ­ - bottomless pit 3. A natural ______ exists between monkeys and apes. - a natural attraction 4. The _____ young man helped the old lady carry her groceries to her car. - agreeable 5. Many athletes drink sport drinks to _______ their thirst. - soothe; to make less severe