Read each sentence carefully. If the correct simple subject and verb or verb phrase has been underlined, place an A in the blank. If the incorrect words have been underlined, place a B in the blank.
16. The new car is a blue-and-white four-door sedan.
17. Small cars use less gasoline than large vehicles.
18. Some owners of the large cars have traded them for smaller models.
19. Dual air bags make the car very safe.
20. Many larger cars have an extra tax on them.​