Jawaban:

1. Telephone was invented by Alexander Graham Bell in 1786.

2. Internet is used by students to send messages.

3. The receiver must be hung by the caller.

4. The number should be dialed by one.

5. The documents by facsimile can be sent by them.

6. International communication system have to be learnt by us.

7. Telephone bill on the fifth day are paid by people every month.

8. The province is divided by them into several area codes.

9. The letter will be delivered by him to customers.

10. The messages are received by the telephone operator.

Cmiiw