【单选题】All applicants should be at least 16 years of age at the commencement of this course. The underlined word " commencement " can be replaced by _______.
【简答题】One day when Jack was walking in the park, he saw a woman, who lived a few miles away, sitting on a bench with a dog beside her. The dog was looking up at the woman. Jack walked up to the woman and sa...