The phrase "normal business activities" can be replaced by several synonyms depending on the context. Some of the most common ones include "regular operations," "routine tasks," "standard procedures," "daily tasks," "usual undertakings," and "typical affairs." These synonyms can be useful in business reports, discussions, and meetings where conveying the same meaning in diverse ways can help avoid monotony. Using synonyms can also be valuable in setting a tone of formality or informality and depending on the audience of the communication. In general, having access to a diversified vocabulary offers a more nuanced and precise way of communication that can enhance the clarity, coherence, and impact of the message.