Now people can pay by scanning(扫描）their faces while shopping. Is it _______ to pay by scanning other parts of our bodies? Amazon has a new technology that scans _______.

The technology can tell if the person is the right one by scanning his or her hand. The scanner examines things such as finger prints. It then sends a picture to a certain center which can decide who the person is.

In September 2019, Amazon made a payment system for a US supermarket. People can pay _______ by scanning their hands under a machine. Their hand scan is connected to their bank cards, so they can pay successfully. It's quite convenient, especially for _______ people. With this new technology, people _______take their cards with them. They just scan their hands.