—What is he doing now?—He’s ________ the teacher in class now.
---Do you often ________ English books?---Of course.
My legs were ________ tired ________ I wanted to stop.
---There is ________ milk in the fridge. Please buy some on your way home. ---All right.
I guess Lucy can enjoy ________ at the dancing party.
Did Linda buy anything ________ her mother ________ her birthday?