What to greet when meet face to face with LHL

In the army, it is an offence not to greet officer as "Sir". As a civilian, when we meet our PM, is it also mandatory to greet as Sir ?
What will happen if we simply say "Lee" , w/o the Mr ?
How will you greet him ?

hi, are u a model?
 
我看你印堂发黑,这个月必是有血光之灾。:cool:
 
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