问题补充：
根据句意和汉语注释，写出单词的正确形式。
【小题1】The suggestions （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 cultural（文化）center of China.
【小题3】Tonight, they are going to celebrate their father’s fortieth (四十) birthday.
【小题4】How beautiful those circles on those butterflies’ (蝴蝶)wings are!
答案：
解析：
【小题1】他们提供给我们的建议，要用建议的名词复数形式，suggestions。
【小题2】cultural“文化的”是形容词来修饰后面的名词。
【小题3】某人的多少岁生日，要用相应的序数词。故用fortieth
【小题4】这些蝴蝶的翅膀，要用蝴蝶的复数的所有格。故用butterflies’
考查：单词拼写。
根据句意和汉语注释 写出单词的正确形式。【小题1】The suggestions （建议）they have offered us are very useful we shoul
