Focus Four Hazards in the Construction Industry Pre-Test Answer Key Circle the correct answer 1. On an average, how many construction workers are killed at construction sites each year? a. 100 - 200 c. 1,000 - 1,200 b. 500 - 700 d. 2,000 - 2,500 2. What are the two of the top four causes of death in construction site accidents?