用所给单词的适当形式填空。

guest    weigh    culture    certain   total

After coming to China, Amy became really interested in Chinese traditional      and way of life.
These apples in the box are about three kilos in     .
You bought two hamburgers and a can of cola. The      cost is ten dollars. 
They are coming to my birthday party as my      this evening.
Linda sings best in our school. She is      to win the singing competition.