下列句子中，每句都有一个错误，请找出错误之处并改正。

1. The price in this city is very expensive. ______

2. We must do all we could help those who are in difficulty.______

3. This is the river which I used to swim when I was a student.______

4. This is one of the best film I have ever seen.______

5. China now can produce the fastest computer of modern time.______

下列关于计算机软件的叙述，错误的是（）。

A.操作系统产生于高级语言及其编译系统之前

B.为解决软件危机，人们提出了用工程方法开发软件的思想

C.数据库软件技术、软件工具环境技术都属于计算机软件技术

D.设计和编制程序的工作方式是由个体发展到合作方式，再到现在的工程方式