编写代码，将给定文本中的所有单词字母都变成大写字母。


文本：The quick brown fox jumps over the lazy dog.
```python
text = "The quick brown fox jumps over the lazy dog."
text_upper = text.upper()
print(text_upper)
```

输出结果为：

```
THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG.
```