The bank returned the cheque to me because i(not to sign) it

The bank returned the cheque to me because I hadn’t t signed it.

Банк вернул мне чек, потому что я его не подписал.

Did the bank return the cheque to me because I hadn’t t signed it?

What returned the cheque to me because I hadn’t t signed it?

What did the bank return?

Why did the bank return the cheque to me?

Did the bank or did the shop return the cheque to me because I hadn’t t signed it?

Did the bank return the cheque to me or to him because I hadn’t t signed it?

The bank returned the cheque to me because I hadn’t t signed it, did not it?