What is your mother doing, Linda?
She ___________dinner in the kitchen now.( )
A.is cookingB.was cooking
C.cookD.cooking
The girl is so good at singing that she can sing _______ than anyone else.
Mike is good at sports. He jumps much _______ than the other boys in the class.
- What's wrong with Mary? - She's______ at her sister's bad behavior.
—What are you going to give your father for his birthday? —I am not sure. But I’ll buy him _______.
—Who sings _______, you or Jack? —Jack, but I dance _____ than he!