I have an interesting book (on) chinese history括号中为什么用on

I have got an apple i have an opportunity是什么意思? I have an什么cap `I have been an idiot!' “I have an important meeting to have 简单的英语短文填空选择所给词适当形式填空：become,orange,be,fun,think,many,she,go,eat,brownDifferent people have different color skin.Some have black or ＿ skin,some have yellow skin,and some have white skin.Here is an interestin 翻译：I have an orange orange. I have an interesting thing( )you Can i have an ice cream I----(have)an exciting party last weekend. I,sent,you,have,E-mail,an I have an English class_____a week. can i have an ice cream can i have an apple?怎么回答 may I have an ice cream?是什么意思 Can I have an apple?cerainly是什么意思 I want have an English name速度 I have an eraser同义句