While I_______ a detective story, someone_______ at the door．
| A．read, was knocking |
| B．read, knocked |
| C．was reading, knocked |
| D．was reading, was knocking |
________ you know Peter?
| A．Are | B．Do | C．Does | D．Is |
How many ________ are there in the school?
| A．librarys | B．classes | C．glass | D．grade |
—Are there any balls under the chair? —________.
| A．Yes, there is | B．Yes, they are | C．Yes, there are | D．No, there are |
There is an art room ___ the first floor.
| A．in | B．at | C．on | D．for |
There ________ some bread and eggs on the plate（盘子）.
| A．is | B．am | C．are | D．be |