上个月我们年级举办了数学竞赛，许多同学也参加了竞赛，我擅长于数学，经过努力我获了奖。老师表扬了我，同学也为我高兴。
Last month there was a math contest in our grade。 A lot of students joined it。 I prepared for it carefully and worked hard。 I got the prize and our teacher praised me。 My classmates were glad for me。