按要求完成下列各题。

1. Sam: How about trying the new French restaurant tonight?

   Tom: I heard it's very expensive. 

   Sam: Why don't we go Dutch? 

   Tom: Good idea!

    Read the dialogue, can you guess the meaning of "go Dutch"? You may answer it in Chinese. 

2. Sue is 5 years older than her younger brother Paul. Paul is 6 years older than Jim, the youngest in the family.

    If the total of the children's ages is 32, how old is the eldest child? 

3. What number should replace the question mark in the last circle? 

4. Which letter should appear in the final medal?

5. Look at the shapes and codes given. Work out the code which matches the shape given at the end of the line.

在建设项目各类招标中，招标文件中仅提出设计依据、技术指标、工作范围等内容，而无具体工作量的是（）招标。

A.施工

B.设备采购

C.设计

D.材料采购