填空题

Dear Client,
Office Angels Agency is advising businesses to plan as far ahead as possible to ensure guaranteed staff cover during holiday periods. There is now a serious shortage of skilled secretarial and administrative staff and this is expected to get worse over the next twelve months.
Businesses which require staff with experience of specialist computer applications are the most at risk. You are advised to contact our agency well before the staffs are actually needed to be certain of filling gaps with adequately trained personnel. If you don’t, it’s almost certain that you will be left without the skills needed to keep your office running smoothly.
The reason for the shortage of secretarial staff appears to be a combination of two factors. There has been an increase in the demand for secretarial services over the last few years, and at the same time there has been a lack of students deciding to choose secretarial studies.
Office Angels Agency would like to emphasize that businesses should not underestimate the difficulty of getting experienced temporary staff. It is also necessary to make the point that businesses should be prepared for the fact that they may have to pay more for this kind of service in the future.
What is the second reason for the shortage of secretarial staff
A(n) ______ deciding on secretarial studies.