Final answer:
The correct word to fill in the blank is 'tendency'. Guests have a tendency to use the indoor pool in the summer.
Step-by-step explanation:
The correct word to fill in the blank is tendency. Surprisingly, guests have a tendency to use the indoor pool in the summer. A tendency refers to a likelihood or inclination towards a particular behavior. In this case, guests have a tendency to use the indoor pool during the summer months.
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