The April Fools' tradition is said ________ in the sixteenth century.
The black horse is ______ of the pair.
Much to his surprise, he invited only twenty friends to the dinner, but ______ came.
Not until I had arrived home______ my appointment with Michael Smith.
______ lots of times, the song doesn’t sound as nice as before.
Bill Gates has created a wonderful “window”, ______ people can surf the Internet freely.