Filter duplicate rows based on a field

Question

I have several records (bills) that are basically duplicates of each other, except for one field, which represents the language that bill is in.

For example:

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Answer 1

select
ID,BillID,Account,Name,Amount,max(Lang)
FROM Bills 
WHERE Account='abcd'
group by BillID,Account,Name,Amount;

Given that you are not giving priority to any specific language if there is same bill in multiple languages. The above query will work perfect.

EDIT : Removed "ID" from group by. @Phil You are right..!!