47．According to university officials，who are put in an unfavorable situation under early admission programs?
　　48．Different from Harvard，many colleges and universities require the admitted applicants to＿＿.
　　49．Early admissions programs received great popularity in that they helped colleges to secure the recruitment of＿＿．
　　50．If a student is admitted under a binding early admission program．he will not be able to＿＿before making decision．
　　51．What procedure still works this year and is in progress in Harvard University’s freshmen recruitment now?
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