Meaning: 'Prior' means 'before' or 'earlier in time,' indicating that his role as sub-dean occurred before his current position.

Wrong options:

• Started: 'Started' implies the beginning of an action, which does not fit the context of describing a previous role.
• Across: 'Across' suggests a spatial relationship and does not relate to the temporal context required here.
• Simple: 'Simple' describes something that is easy or uncomplicated, which does not fit the context of discussing a previous position.

Correct answer: campus

Explanation: The term 'campus' refers to the grounds and buildings of a university, making it the appropriate choice in this context as it describes a specific location related to the university mentioned.

Meaning: 'Campus' refers to the physical grounds of a university or college, where educational activities take place.

Wrong options:

• launch: 'Launch' refers to the act of starting something, which does not fit the context of a physical location.
• hall: 'Hall' typically refers to a large room or building used for meetings or events, which is not the correct term for a university setting in this context.
• place: 'Place' is a general term for a location and lacks the specificity required to describe a university setting.

Correct answer: progressed

Explanation: The word 'progressed' indicates advancement or development, which fits grammatically and contextually as it describes David's career development from a teacher to principal positions.

Meaning: 'Progressed' means to move forward or advance in a career or situation, indicating his growth in the education field.

Wrong options:

• referred: 'Referred' means to mention or direct attention to something, which does not convey the idea of career advancement.
• rested: 'Rested' implies taking a break or pause, which contradicts the idea of moving forward in a career.
• preferred: 'Preferred' indicates a choice or liking for something, which does not fit the context of career advancement.

Correct answer: entering

Explanation: The word 'entering' indicates the action of beginning a new phase, which fits grammatically and contextually as it describes David's transition into higher education.

Meaning: 'Entering' means to begin or start a new phase or level, in this case, moving into higher education.

Wrong options:

• going: 'Going' is a general term for movement and does not specifically indicate the transition into a new field of education.
• seperating: 'Separating' implies a division or disconnection, which does not fit the context of moving into a new educational role.
• interacting: 'Interacting' refers to communication or engagement with others, which does not relate to the transition into higher education.