Why does george order lennie not to talk when they get to the ranch?

George orders Lennie to not talk when they get to the ranch because "George says that if the boss hears Lennie talk before he sees Lennie work, the two men won’t have a chance of getting the job."

Hope this helped! ^-^
Source: https://www.enotes.com/topics/of-mice-and-men/teacher-resources/quizzes

The correct answer is "bantu".