【正文】
A small, happy little dog learned 1. ___________ this place and decided to drop by① . When he arrived there at noon, he ran happily 2. ___________ the stairs to the (Section A 3a— 3c) doorway(門廊 )of the house. He looked through the doorway excitedly with his ears lifted high and his tail wagging as fast as it 3. ___________. To his great 4. ___________, he found himself staring② at 1000 other happy little dogs with their tails wagging just as fast as his. (Section A 3a— 3c) He smiled a great smile, and was answered with 1000 warm and friendly great 5. ___________. As he left the house, he thought to himself③,“ This is a 6.