国家对房地产中介服务人员的管理实行下列哪些措施______

A．执业咨询认证

B．统一考试

C．注册登记

D．执业须有必要的财产和办公场所

E．年检

—Why are you standing there, Maggie
—I can't see the blackboard clearly. Two tall boys are sitting ______ me.

A. behind
B. in front of
C. beside

D. next to