19. The                                                     communication services, along with chat rooms, continue to be an important part of children's online interactions.

  A. online                B. offline              C. direct                 D. phone

20. Email                                                 are often necessary to join social networking sites, online, and virtual worlds.

  A. address              B. information     C. senders              D. accounts

21. Email, and chat rooms let children       with friends and family members.

  A. talk                    B. say                  C. speak                 D. communicate

22. Skype is a voice                                 allowing users to talk to others across the world.

  A. hardware           B. software application     C. Internet access          D. web browser

23. Luckily, there are many communication techniques to help overcome           .

  A. foreign languages      B. culture shocks    C. language barriers         D. sound barriers

24. ……………interesting it is to meet our teachers and friends again!

  A. What                 B. How               C. Who                  D. which