通读下面的短文，然后从后面各题所给A、B、C、D四个选项中选择可以填入空白处的最佳答案

Today is Tom's birthday. He is seventy years old. But there is nobody being1him. He feels very disappointed. He can't find his happiness anywhere. His sons who are busy, working don't care for him on his special day. 2the cake is very delicious, he doesn't want to touch it. He just3his children to come and stay with him.

Nowadays, many people are so busy that they4visit their parents. However, blood is 5thicker than water. Our dear parents make every effort to bring us up, so we are supposed to treat them well when they become old.