When anyone opens a current account at a bank, he is lending the bank money, repaying of w

hich he may demand at any time. Primarily, the bank customer relationship is that of debtor and creditor—【C1】______ is which depending on whether the customers account is in credit or is overdrawn. However, 【C2】______addition to that basically simple concept, the bank and its customer owes a large number of obligations to one another. Many of these obligations can give【C3】______ to problems and complications but a bank customer, unlike, say, a buyer of goods, cannot complain that the law is loaded against him. The bank must body its customers【C4】______ , and not those of anyone else. When, for example, a customer first opens an account, he instructs the bank to debit his account【C5】______in respect of cheques drawn by himself. He gives the bank specimens of his【C6】______, and there is a very firm rule that the bank has no right or authority to pay out a customers money on a cheque on which its customers signature has been【C7】______ . It makes no【C8】______ that the forgery may have been a very skillful one: the bank must【C9】______ its customers signature. For this reason there is no risk to the customer in the modern practice, adopted by some banks, of printing the customers name on his cheques. 【C10】______this facilitates forgery, it is the bank that will lose, not the customer.

【C1】

A．what

B．when

C．who

D．why