The correct answer is 'to.' Key Points - Let us look at the usage of the given options: - We use for to talk about a purpose or a reason for something. - Example: I want to visit him only for you. - We can use to as a preposition to indicate a destination or direction. - Example: We 're going to Liverpool next week. - We use in for something inside or enclosed by something else. - Example: I was travelling in her car. - Use "onto" as a preposition to describe the direction of an object moving toward a surface. - Example: She set the box onto the table. - Correct sentence: Few things are impossible to achieve with diligence and skill.