Most animals have little connection with _______ animals _____ different kind unless they kill them for food.
Xi’an was attacked by such a terrible smog _____ few residents had ever experienced before.
____ an important decision more on emotion than on reason, you will regret it sooner or later.
The way _____ was thought of by him was similar to the way ______ we carried it out.
You can not imagine what great difficulty we had _____ the home for the old.
--- Hi, Jane, I’m going out for a walk in the park. --- ______ !