阅读对话，判断句子正(T)误(F)。
Mike: Hello. Peter! Are these your trousers?
Peter: No, they aren't. My trousers are blue.
Mike: Are these Albert's trousers?
Peter: No. His trousers are black.
Mike: Whose trousers are these, do you know?
Peter: Sorry, I don't know.
1．Peter's trousers are blue. （________）
2．Albert's trousers are black. （________）
3．The trousers are Mike's. （________）
4．Peter doesn't know whose trousers they are. （________）
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