5. 但他们之间的联系仍然很密切。许多老年人仍然帮着照看孙辈。年轻夫妇也抽时间探望父母，特别是在春节和中秋节等重要节日。

A. But the connection between them doesn’t change. Many seniors will help take care of their grandkids, young couples will take time to visit their parents as usual, especially during the Spring Festival and Mid-Autumn Festival --- the most important festivals in China.
B. but the connection between them remains close. Many seniors still help look after their grandchildren and young couples also take time to visit their parents, especially during important festivals such as the Spring Festival and Mid-Autumn Festival.
C. But the relation between them never change --- Many old couples will help to look after their grandkids while young couples will visit their parents as usual, especially during the Spring Festival and Mid-Autumn Festival, which are the most important festivals in China.
D. but their relation remains close. Many old people still help to take care of their grandchildren, at the same time young couples will take time to visit their parents, especially during important festivals like the Spring Festival and Mid-Autumn Festival.