Answer: are, going, are, holding, am waiting , help's, came, are, doing,
Explanation:
Four challenges that could impact domestic tourism could include natural disasters like forest fires keeping people out of an area due to the danger to life and limb, social unrest such as in Venezuela right now with the violence of the right wing in Caracas especially, poor economy with high unemployment so that many people can't afford to travel even locally, and seasonal activities that can only be done in certain parts of the year like boating in the summer and skiing in the winter.
