Answer:
1. saturated
2. adapt
3. volatility...mercurial
Explanation:
1. Sodden is a term used to denote that something is completely soaked, oversaturated with water (for example: carpet, clothes, backyard after massive rains, socks etc.) From that, we could infere that "saturated" has the closest meaning to "sodden".
2. From the context of the sentence, we can conclude that businesses need to properly answer to the change of economic circumstances. That basically means that they need to adjust, to adapt to the new situation.
3. Again, we use the context of the sentence to determine the right answer. Basically, the sentence is about a man whose mood changes reflected on the changes of his stock portfolio. So, we need to find the pair of words that denotes changes and inconsistencies, and the only adequate pair is "volatility...mercurial".