River: he 2nd tone
Nan: nan 2nd tone
Wo: he 2nd tone
Mu: mu 4th tone
Electricity: dian 4th tone
Zi: zi 3rd tone
Commerce: shang 1st tone
Service: wu fourth tone
You: you third tone
Limit: xian fourth tone
Gong: gong first tone
Si: si first tone
The first tone is the first tone in the Chinese language.