Underline the noun in parentheses that best completes each sentence.

(Telephones, telephone's) have changed greatly over the past few years.
1. Speaker (phones, phone's) are already commonplace in some American homes.
2. The cellular (phones, phone's) mobility is very convenient.
3. Many (satellites, satellite's) have replaced familiar phone lines.
4. Satellite communication eliminates many (delays, delay's).
5. New (horizons, horizon's) are upon us as we enter the twenty-first century.
6. Telephones that include video (images, image's) are already being perfected.
7. These (videophones, videophone's) may soon become standard communication.
8. Many (computers, computer's) regulate the phone lines.
9. Business (executives, executives') travels are simplified with this technology.
10. Can you imagine the (problems, problem's) people used to have with the old phones?
11. Now salespeople can show their (products, products') on television.
12. Then, (payments, payment's) can be completed over the phone.
13. A regular telephone (visits, visit's) a good cure for loneliness.
14. Taking place over phone lines, online data (services, service's) connect people across
the world.
15. Soon, most people will have access to all (types, type's) of communication.
16. A (persons, person's) going to be amazed at all the new possibilities.