21. At the APEC Summit held in Yokohama, Japan, Asia-Pacific leaders addressed__________ _____ over global growth, regional economic development and emerging markets.

A. concerns                     B. careers                    C. adaption                 D. recognition

22. As is known to us all, our Chinese government is now making every         to stop the house price from growing too fast. 

A. effect                 B. effort                            C. measure               D. performance