阅读对话填空。
Sandy: where are you from?
Dongdong: I’m from China. Excuse me. Who’s this?
Sandy: This is my friend, Cody. She’s Australia.
Cody: Nice to meet you! Is Dongdong your first name?
Dongdong: Yes, my last name’s Wang.
Cody: Is Bill your brother ,Sandy?
Sandy: Yes, we’re twins.
（1）Sany and Billy are________.
（2）Cody and Dongdong are Sandy’s_________.
（3）Cody is from________.
（4）Dongdong is his _______name.
（5）Dongdong is __________(国籍)