With the _______ (1) development of technology, people's lives have changed dramatically. The _______ (2) of the internet has made communication more convenient and efficient. People can now access information from anywhere in the world _______ (3) the click of a button. However, this rapid change has also brought some challenges. One of the most significant challenges is the issue of cyber security. With the increasing use of the internet, there have been more and more cases of cyber attacks and data breaches. Therefore, it is _______ (4) for individuals and companies to take necessary measures to protect their data and systems.

选项：
A. worldwide
B. rapid
C. crucial
D. introduction

答案解析：

1.(B) rapid：此处需要填入一个形容词来修饰“development of technology”，从所给选项中，“rapid”意为“快速的”，符合文意，表示“随着技术的快速发展”。

2.(D) introduction：此处需要一个名词作为主语，且能与“of the internet”构成合理的搭配。从选项中，“introduction”意为“引入、介绍”，与“of the internet”搭配，表示“互联网的引入”。

3.(A) worldwide：此处需要一个副词来修饰“access information”，表示信息的获取范围。从选项中，“worldwide”意为“全世界的”，符合文意，表示“人们现在可以通过点击按钮就能获取全世界的信息”。

4.(C) crucial：此处需要一个形容词来修饰“for individuals and companies to take necessary measures”，表示采取措施的重要性。从选项中，“crucial”意为“关键的、重要的”，符合文意，表示“因此，对于个人和公司来说，采取必要的措施来保护他们的数据和系统是非常重要的”。