Standing amidst the pupils:
Standing amidst the pupils allows the teacher to engage with them more effectively. It creates a sense of closeness and helps in building a stronger connection with the students. This proximity also ensures that the teacher can closely monitor the students' reactions and responses during the questioning process.

Speaking loudly:
Speaking loudly is important to ensure that all students can hear the questions clearly. This is especially important in a classroom setting where there may be distractions or noise that could hinder students from hearing the questions properly. Speaking loudly also conveys confidence and authority, which can help in maintaining discipline and focus during the questioning process.

Following the principles of variety:
Variety in questioning techniques is crucial for keeping students engaged and interested. By using a variety of question types such as open-ended, closed-ended, multiple-choice, and reflective questions, teachers can cater to different learning styles and preferences among students. This variety also helps in promoting critical thinking skills and encouraging active participation in the learning process.

All of the above:
By standing amidst the pupils, speaking loudly, and following the principles of variety in questioning, the teacher can create a conducive learning environment where students are more likely to be attentive, engaged, and actively participate in the learning process. These practices also help in promoting effective communication, building rapport with students, and fostering a positive classroom atmosphere conducive to learning and growth.