单词辨音（每小题0.5分，共5分）
I don’t remember when and where I __________ this umbrella.
－What’s his brother? －He is a teacher.He__________ maths at a school.
－Help yourself to some more meat,Linda. －_______________.
－Do you need my help, Mary? －_____________.
－Hello,Jack.How are you doing? －__________.
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