Promise with teacher

Teacher:"promise karo kabhi cigarette
nahi piyoge
All Students:"Nahi piyenge sir kabhi
nahi pienge,
Teacher:"Promise karo kabhi sharab
nahi piyoge
All Students:"kabhi nahi pienge sir,
Teacher:"promise karo kabhi kisi ladki
ki taraf dekhoge bhi nahi
All Students:"Nahi dekhenge,
Teacher:"Promise karo desh ke liye
apni jaan de doge
.
.
.
All Students:"Jaan bhi de denge sir aisi
jaan rakh k karenge bhi kya..