ere known as “aborigines”, _____ “the first people of the country”

下列各句中加点的成语使用恰当的一句是（ ） （ ）

I was advised to arrange for insurance ____ I needed medical treatment.

33．— We should recycle everything we can．— Absolutely．These may seem little things，but they’re not__________itcomes to saving theenvironment．

15. Three quarters of the land here _____ wet land, an ideal place for migrating birds.