I have drawn up a few, and the landlord can choose to use them. Just change xx to your corresponding place name:

1, a century-old plan, quality first!

2. Warm congratulations on the successful completion of the xx tunnel project!

3, create a Millennium career, a century-old dream!

4. Make great achievements and build a harmonious new xx!

5.xx tunnel project is completed, and xx economy takes off!

6. Unity is strength, seeking truth and being pragmatic, and achieving good results; Unite as one, develop rapidly and achieve brilliant results!

7. Build xx tunnel to open the road to wealth for xx people!

8. Warmly welcome leaders at all levels to attend the completion ceremony of xx tunnel project!