Keys:

　　Passage One:

　　1. Y

　　2. N

　　3. NG

　　4. N

　　5. guaranteed

　　6. Internet access

　　7. two customer satisfaction programs / a customer hotline and a customer call-back program

　　8. higher prices of their pizzas

　　9. reckless driving by their drivers

　　10. the same

　　Passage Two:

　　1. (N)

　　2. (N)

　　3. (Y)

　　4. (NG)

　　5. (in different settings)

　　6. (what the child is going through)

　　7. (recruit young adults)

　　8. (social inequality)

　　9. (completely sterile or homosexual individuals)

　　10. (secret)

　　Passage Three:

　　1. (N)

　　2. (Y)

　　3. (N)

　　4. (N)

　　5. (use them / capitalize on them / be curious enough to capitalize on them)

　　6. (responsible enough to own a firearm )

　　7. (more, than)

　　8. (prevalent across the schools / common in schools)

　　9. (be shot / be victimized)

　　10. (hunting)

　　Passage Four:

　　1. (Y)

　　2. (NG)

　　3. (N)

　　4. (Y)

　　5. (hydrogen)

　　6. (the gravitational forces)

　　7. (black band)

　　8. (the same)

　　9. (dwarf planet)

　　10. (size / disproportionately small size)

　　Passage Five:

　　1. (N)

　　2. (N)

　　3. (N)

　　4. (Y)

　　5. (fat soluble vitamins and water soluble vitamins)

　　6. (vitamin A)

　　7. (fracture / breaking their bones)

　　8. (sunlight / sunlight exposure / exposing to sunlight)

　　9. (toxins)

　　10. (plant and animal tissues involved in metabolism / liver, yeast and dairy products)