First, ADCDCBCADCCDACB second. 1. It took seven months to build the dam. 3. Because it was far away. 4. He could.

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Third, 1. Have you read 2? Is there anything interesting? You've heard of that 4. You've seen five. You're welcome.

4. 1. I just made two. Haven't been to 3. It took him three days. I'll help you find 5. This is why they have been working hard.