[[Remainder of this page has been left intentionally blank.] CDH Inservice Limited Shangzhi Wu Director CDH China Growth Capital Fund II, L.P. CDH China Growth Capital Holdings Company Limited, its General Partner Shangzhi Wu Director CDH China Growth Capital Holdings Company Limited Shangzhi Wu Director] [CUSIP No. G2352K 108 1 NAMES OF REPORTING PERSONS 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) o (a) þ (b) 3 SEC USE ONLY 4 CITIZENSHIP OR PLACE OF ORGANIZATION British Virgin Islands 5]

[Joint Filing Agreement [ Yinan Hu Yinan Hu Kingsford Resources Limited Yinan Hu Director High Rank Investments Limited Qiuping Lai] [CUSIP No. G2352K 108 1 NAMES OF REPORTING PERSONS 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) o (a) þ (b) 3 SEC USE ONLY 4 CITIZENSHIP OR PLACE OF ORGANIZATION People’s Republic of China 5 SOLE VOTING POWER NUMBER OF]