I think English will do what ------ promised to do.--------believe our country will be more and more stronger.--------is raining heavily these days.填人称代词

问题描述:

I think English will do what ------ promised to do.
--------believe our country will be more and more stronger.
--------is raining heavily these days.填人称代词

it
I
It

I think English will do what it promised to do.
I believe our country will be more and more stronger.
It is raining heavily these days.