2: Jiexing ("Jiexing" means fast speed and thoughtful service)
3: Longyang ("Yang": harmonious and smooth. The business of metaphor is smooth sailing)
4. Xingcheng (the word "city" has a wide range of metaphor, which also shows the strength of your business)
5. Longdu (the word "du" here means the meaning of a geographical coordinate, that is, your natural gas company)