设圆 C 与圆 (x-5) 2+y2=2 ，关于 y=2x 时称，则圆 C 方程为 ( )

John says that his present job does not provide him with enough ______for his organizing ability.

Thedestructionofthetwintowers_________shockandangerthroughouttheworld．

Hiswifehasbeen_______alotofpressureonhimtochangehisjob.

Itisestimatedthat，currently,about50，000speciesbecome_____everyyear．