用所给关系词完成短文.My school life is always very exciting.Last week

用所给关系词完成短文.
My school life is always very exciting.Last week I went to a school concert,_____ was a great success at last.I got the best seat _____ I could see and hear very clearly.I never forgot the most exciting time ______ a popular song was sung by David and John,both of _____ are my classmates.The reason _____ I admired them a lot was that they could sing to the guitar.I expect to give such a wonderful performance one day.