I.用be的适当形式填空：
(1)There an apple on the table. (2)There some pens in the pencil-box.
(3)There a ruler and an eraser on the floor.
(4) there any children in the room? Yes, there .
(5)How many books there in the box? There seven.
(6) There __ a pen and three pencils in my pencil-box.
(7)There many boxes on the chair.
(8)There two rulers and an eraser in my pencil-box.
(9) What under the tree?
(10)There some meat and vegetables in the fridge.
（11）The meat and fish _____ healthy food.
