I have two storybooks, but Helen ______ four.
A .has B. have C. had
David is playing ______ basketball .
A .a B. the C. \
--Hello, is that Liu Tao? --Yes, ______.
A .I am B. it is C. speaking
--Are there any students in the classroom?
-- Yes, there is ______ students in the classroom.
A .any B. some C. a
The brown cat is as ______ as the black cat.
A .fat B. fatter C. thinner