Answer:
1. P Throwing papers along the streets
2. DC While debris covered the park
3.P With the broken glass in the alley
4. P Beside old trucks and cars
5. IC No one lives there
6. P For lights on every corner
7. DC If the expense is too great
8. DC As he walked home
9. DC Dragged up the subway steps
10. IC Thousands of people walk every day
11. DC Racing against the traffic signal
12. DC Unless it rains
13. DC When a helicopter hovers overhead
14. DC Who plays basketball in the empty lot
15. DC That lives in town
Explanation:
Have* this is because has* is past tense and have is more appropriate since there are multiple things you are referring too (Mercury, Venus, Earth and Mars). To be honest, these planets have a molten core.
The error in the possessive construction is that, instead of passenger's, it should be "passengers'". The apostrophe should be after the letter "s" because the noun is in the plural form. The correct sentence would be "Passengers' concerns about cell phone use on planes are justified."
