It was along the Mississippi River ________ Mark Twain spent much of his childhood.
It’s the third time _____ arrived late this month.
The Golden Gate Bridge, _______ several hundred years ago, is worldwide famous.
Paper produced every year is ______the world’s production of vehicles.
We had a long way to go, and the snowstorm ________ our difficulties.
--May I open the window? It’s too hot.--_____________.