21. Who is the man ______ a blue shirt? I have never seen him before.
A. is wearing B. dressed up C. dressed in D. worn
22. _______ once before, after your class I got my visa（签证）. So thank you again.
A. Having rejected B. Rejected C. Being rejected D. To be rejected
23. The police will have to the room for fingerprints.
A. check B. examine C. clean D. analyze
