Let’s ________ the blackboard.
A. be B. clean C. to clean
—Are there any balls under the chair? —________.
A. Yes, there is B. Yes, they are C. Yes, there are
There is an art room ___ the first floor.
A. in B. at C. on
There ________ some bread and eggs on the plate（盘子）.
A. is B. am C. are
How many ________ are there in the school?
A. librarys B. classes C. glass
There are four ________ students in our school.
A. hundred B. hundreds C. hundreds of
