8, He had spotted a tiny bottle at the bottom of my case and he pounced on it with delight.

介词短语－－with delight "欣喜若狂的"

with和抽象名词搭配，表示内心充满了一种感情
自信地： with confidence

细心地： with care

骄傲的： with pride

欣喜若狂的：with delight

惊讶的： with surprise

pounce on:向...猛扑过去，对...大做文章
e.g. The policeman pounced on the thief.

e.g. Don't pounce on my mistake.

9, 'You should have declared that. ‘Perfume is not exempt from import duty.'

should have 和过去分词搭配，表示本应该做某事却没有做，具有谴责性的味道。
e.g. You should have arrived here five minutes earlier.

e.g. You should have told me about it.

本不应该做某事：shouldn't have done

exempt:免除的，被免除的 be exempt from新概念英语第三册下载

e.g. Drinks are not exempt from import duty.