According to a 1, about 25 percent of college students have a part-time job. By the upcoming summer vacation, this figure will 222%. College students are working as tutors, waiters or salesmen. Why do they want part-time jobs? First, they want to earn money to help cover the increasing college tuition. Second, they hope to be economically 3and buy what they need. 4, by doing part-time jobs, college students can gain some social experience and 5their horizons. What's more, part-time jobs can provide them with a valuable opportunity to know the outside world.
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【正确答案】 1、survey,    2、increase by,    3、independent,    4、In my opinion,    5、broaden    
【答案解析】解析：分析句子结构可知，空格处应填入一个动词原形或动词原形词组与gain并列作句子的谓语。结合录音可知答案为broaden，意为“扩大，拓宽”。