The store is very busy and clustered with customers and their shopping carts waiting in line and shopping .
It is certain that a crowd of people has come to a store because of a big sale .
Chances are about even that a crowd of people has come to a store because of a big sale .
It is certain that a crowd of people has come to a store because of a big sale .
A crowd of people has come to a store because of a big sale .