Here’s a suggested way to fill in the blanks:

1. traditions
2. practise
3. custom
4. we
5. to break
6. maintain

So the completed passage would look like this:

"I think each family has their own customs and (1) **traditions**. For example, my uncle's children always spend two weeks in the countryside in summer time. Holding a party on everyone's birthday is another custom they (2) **practise**. As for my family, it is becoming a (3) **custom** for us to bake a special cake on the last Sunday of each month. We also have a home cinema night every Saturday when we enjoy a film together. For my extended family, (4) **we** gather on the first day of the Lunar New Year. In my opinion, it is good for families to (5) **break** from time to time, they can (6) **maintain** their traditions. However, with tradition and try something new to add variety to their lives."