Or the teacher can provide some hints and let the students guess what is in the box, and then put their hands into the box to touch to judge whether they are correct.
Alternatively, the teacher can provide some prompts for students to guess what is inside the box, and then reach into the box and touch it to determine if they are correct.
Or the teacher can provide some hints for students to guess what's in the box, and then reach into the box and touch it to judge whether they are right or not.