推荐回答（3个）
Our school has a series of activities for girls' day. 一系列活动应该yoga复数
I had great difficulty in deciding to take part in the singing competition with my roommates. have difficulty in doing sth 做某事有困难
It was a real challenge for me because i had never sung on the stage.challenge是名词，用形容词修饰
we chose the song seasons in the sun and changed the words 时态统一 改为chose
望采纳
1. activity 改为 activities 2. decided 改为 deciding 3. really 改为 real 4. choose 改为chose
希望可以帮到你~
1、our school has a series of activity for girls' day.2、 i have great difficulty to decide to take part in the singing competition with my roommates.3、it really was a challenge for me because i have never sung on the stage.4、we choose the song seasons in the sun and change the words.
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