The door opened and in ______.
I didn’t like the color of the coat my mother bought me, so she went back to _______ it for another one.
He was seriously injured in the traffic accident. _______ is now no possibility _____ he will make a full recovery.
At night, plants _________carbon dioxide and at the same time _________oxygen. So, we may put some in our bedrooms to purify the air.
Only when I left home to go to college ___ how much my mother had done for me.
For many cities in the world, there is no room to spread out farther, _____New York is an example.