9.When we use a phrase like 'it serves him right', we are, in part, admitting that a certain set of circumstances has enabled justice to act of its own accord.

句子分析

句子的主干：we are , in part , admitting that ...

enabled sb. to do：使...能够做某事

of its own accord：自然而然的

10.When a thief was caught on the premises of large jewellery store on morning, the shop assistants must have found it impossible to resist the temptation to say 'it serves him right.'

...found it impossible to resist the temptation to say..：一定忍不住说...（双否，背诵句型）

He deserves it. / It serves him right.罪有应得新概念英语教材下载

11.Towards midday, a girl heard a muffed cry coming from behind on of the walls.

come from behind :从后面

Ex

 He jumped from behind one of the trees.