How did it______ that humans speak so many different languages?
Trains stop here in order to _____ passengers only.
There are usually at least two _____ of looking at every question.
He left in such a hurry that I _____ had time to thank him.
We had a marvelous holiday: only the last two days were slightly _____ by the weather.
I could tell he was surprised from the _____ on his face.