题目内容：

kite flying became a very popular outdoor acticity.(同义句转换) She isn't old enough to go to scho
1.kite flying became a very popular outdoor acticity.(同义句转换)
2.She isn't old enough to go to school.（同一句转换）
3.I listened carefully but I couldn't hear anything.（同义句转换）

优质解答

1.It is a very popular outdoor acticity that kite flying is.
2.She is too young to go to schoo.
3.I listened carefully but I could hear nothing.