1. (2021七上·温州月考) 用方框中所给单词的适当形式填空，每词限用一次.

her  subject  difficult  buy  then

1. （1） I have many in my school.
3. （2） It is for me to study maths.
5. （3） The boy stands up and says "Goodbye" to teachers.
7. （4） Kitty is the name of .
9. （5） On December 12^th people like many things on Taobao.