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It在这里是形式主语,真正的主语是to make sure。
2.They say they will be here for as long as it takes.
as long as只要, 如果
例句：I'll stay in Mexico as long as my money holds on.
只要我的钱还能维持一天, 我就在墨西哥待一天。
I'll never forget that as long as I am living.
这事我至死也不会忘记。
3.They've already given about $90 million in kind.
in kind以实物偿付
例句：Farmers often like to pay their bills in kind.
农民往往愿用实物抵账。
