A. Gao Shan, please close the door. B. Yes, Mr Green. C. Good morning, class. D. Stand up, please. E. Sit down, please. F. Good morning, Mr Green. ( ) F ( )( )( )( )
( ) Sam, please open the book. ( ) Thank you. ( ) Yes, Mr Wu. ( ) Good afternoon, class. ( ) Stand up. ( ) Please sit down, boys and girls. ( ) Good afternoon, Mr Wu.
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