英语四级作文的开头可以使用以下几种万能句子：

引出开篇类

Recently, the problem of … has been brought into focus.

Nowadays, there is a growing concern over …

With the development of our economy and society, pollution is more and more serious.

Now people become increasingly aware/conscious of the importance of …

提出建议类

There is no doubt that enough concern must be paid to the problem of …

Obviously, if we want to do something … it is essential that …

故事引出类

I have a friend who … Should he….？ Such a dilemma we are often confronted with in our daily life.

Once upon a time, there lived a man who ....

社会现象类

Along with the advance of the society more and more problems are brought to our attention, one of which is that....

As society develops, people are attaching much importance to….

观点对比类

As to whether it is a blessing or a curse, however, people take different attitudes.

图表数据类

From the cartoon, we can see that.

This table shown us that the figures indicate that there is an inspiring tendency of.

普遍现象类

Now, …, they have brought a lot of harms in our daily life.

Today, …, which have brought a lot of harms in our daily life. First, …； Second, ….

科技影响类

Nowadays, with the rapid development of society and technology, an increasing number of issues have emerged.

In recent years, the topic of... has been brought into focus and has been widely discussed.

这些开头句子可以帮助你迅速引入主题，吸引读者的注意力，并为后续的论述打下良好的基础。根据具体的写作内容和题目要求，可以选择最合适的一句或结合几句使用，使文章开头更加生动和有力。