2. If you want to repay foreign currency bills, you can use a personal credit card. At present, most banks support it, such as China Merchants Bank, China Industrial and Commercial Bank, China Construction Bank, China Bank, Bank of Communications, China Guangfa Bank, China CITIC Bank, Industrial Bank, China Minsheng Bank and Ping An Bank.
3. At present, dual-currency cards (US dollars and RMB can be swiped) can be returned to RMB accounts. As for whether RMB is interoperable with foreign currencies, it depends on banks. Please consult relevant banks for details. Please also consult the issuing bank for exchange rate related questions.