21. In _____ film Cast Away, Tom Hanks plays _____ man named Chuck Noland.
A. a; the B. the; a C. the; the D. a; a
22. Air is to us _____ water is to fish.
A. what B. that C. which D. is that
23. The Sound of Music is the first English film I have ever seen.
A．which B．that C．when D. what
