21. It can’t be denied that the Diaoyu Islands are ________ part of China and what some Japanese have done recently is actually ________ offence against Chinese people.
A. a; / B. a; the C. the; / D. /; an
22. Traffic conditions in Beijing ________ for decades. At first people only complained about jams during rush hours，but today every hour is rush hour.
A. is worsening B. have worsened C. have been worsening D. worsened
