以课为单位，对本课所基础知识进行练习，同步实用。

Lesson 45 Cheap or Expensive?

I. 根据括号中所给的汉语用适当的词语填空。

1. Look at that new car. It is too ___________（昂贵的）.

2. Our school has nine ___________（百）students.

3. Ten plus thirty equals ___________（四十）.

4. These books are very ___________（便宜的）. Would you like some?

5. ___________（五十）minus twenty-five is twenty-five.

II. 根据句意用适当的介词填空。

6. Two yuan __________ one eraser. How many would you like?

7. The skirts ___________ sale look very nice.

8. Welcome ____________ our school, Li Ming.