______ worries me that my daughter plays with her cellphone for a long time every day.

My mother told me that the two jackets she bought yesterday were different___size.

It was announced that only when the fire was under control_______to return to their homes.

Lucy, tomorrow is October 1st. I’m going to Kunming for the holidays(假日).—_____

However，at　times　this　balance　in　nature　is＿＿，resulting　in　anumber　of　possibly　unforeseen　effects．