题目内容：

词形变换，用所给词的适当形式填空，每空一词。

1.The classroom is on the         (one ) floor.

2.How many          (family) are there in the pictnre?

3.         (not be ) late again.

4.These are          (we ) books.

5.– Is this knife         (she )?

- No, it’s        (I ).

6.This duck is lovely. It has a good name.        (it) name is Betty.

7.On the left of the box        (be) some books.

8.There are five        (orange) trees in the park.

9.        (who) sweater is this?