下列各项中字形全都正确的一项是（ ）

What’s DIY exactly, Suzy —It_______ “do-it-yourself”, you do something yourself instead of ________ someone to do it.

Here is a dog. Is it yours —Yes. It is very and can follow my directions(指示)。

Canada’s economic wealth is closely linked to _______ of the US, which buys three-quarters of its exports.

____,we would not have achieved so much