题目

Some years ago when I was in my first year in college, I heard Salome Bey sing for the first time. The moment was exciting. Salome’s   36  filled the room and brought the theater to life. I was so   37   that I decided to write an article about her. I   38   Salome Bey, telling her I was from Essence magazine, and that I wanted to meet her to talk about her career. She   39   and told me to come to her studio next Tuesday. When I hung up, I was scared out of my mind. I   40   I was lying. I was not a writer at all and hadn’t even written a grocery list. I intervi一项工程，甲队独做10小时完成，乙队独做15小时完成，丙队独做20小时完成，开始时三队合做；中途甲队另有任务，由乙、丙两队完成，从工程开始到完成共用了6小时，问甲队实际做了几小时？