Before the invention of the Internet, we used to 16. ______(send) greeting cards(贺卡). Now, the Internet allows us 17. ______(send) our thoughts and wishes through e-mails, social network postings(社交网站发帖) and electronic(电子的) greeting cards.

For many people, this is an acceptable way 18. ______(save) time, money and effort, and still to express our care. But for some people, it is not proper. For example, my friend had a birthday party last week, so I 19. ______(send) my best wishes to him on the Internet. He was happy to receive(收到) my greetings. However, my grandmother isn't used to 20. ______(receive) birthday greetings over the Internet. She 21. ______(tell) me that I could call her if I didn't have time to send her a card. When I was little, she used to send me a card on my birthday. I got used to 22. ______(receive) her cards. So I 23. ______(continue) the card-sending tradition with her.

As the Internet changes the way of communication, we have to rethink the customs(习俗) that we used to 24. ______(have). Sometimes we can 25. ______(express) our love and care electronically, but sometimes we need to express it on paper or in person.