People bite food, ________ it will and swallow before it is digested．

A．chewing           B．chewed      C．to chew        D．chew

People bite food, ________ it and swallow before it is digested.

A．chewing          B．chewed            C．to chew           D．chew

 A Bite of China, a documentary _______ Chinese food cultures, reflects Chinese people’s living situations and attitudes.

  A. involves                     B. involved          C. involving                D. involving in