根据句意和汉语提示填写正确的单词。
My little sister                （总是，一直）looks happy.
There’re many______________(绵羊) in the hill.
Is Maths               (困难的) for you?
My father is              （四十）years old.
This is my _______________(最喜爱的) toy.
There are fifteen desks and thirty chairs for              (we).
—            (who) dress is it?   —It’s her blue dress.
My mother is cooking              (potato) for us.
Mr. Li is a              (work).
Are there            (some) reading rooms in your school?