根据句意和汉语注释，写出单词的正确形式。

小题1:The _____________ （建议）they have offered us are very useful,we should take them.

小题2:Beijing is the capital of China,it is also the _______________（文化）center of China.

小题3:Tonight, they are going to celebrate their father’s _____________ (四十) birthday.

小题4:How beautiful those circles on those ________________________ (蝴蝶)wings are!

什么是巴氏杀菌？典型的巴氏杀菌参数？