– I don’t know if Mr. Li ____ to the party this evening.- I think he will come if he ____ free.
—Are there any balls under the chair? —________.
There is an art room ___ the first floor.
There ________ some bread and eggs on the plate(盘子).
There are four ________ students in our school.
There is a clock _______ the wall and windows are _____ the wall.