根据所给的汉语提示，转换下列句型 。

1. What is the matter with you? He asked me.  (改为复合句)    

He asked me            the matter with me.

2. We told him to write to us soon.  (改为被动语态)    

He            to write to us soon.

3. I hurt my knee badly.  (改为被动语态)    

My knee            badly by me.

4. Teachers make students do lots of homework.(改为被动语态)  

Students are            do lots of homework.

5. While she was eating lunch, it happened.(改为同义句)   

 _____   it happened, she was _____ lunch.

某项目的净现金流量情况见下表：

该项目的基准投资回收期Pc为3年半。根据上述资料，回答下列问题。

项目第4年的累计净现金流量是（）。

A．-350

B．-l00

C．200

D．450