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¡¡¡¡( )4. Jack is a good teacher£¬isn¡®t he?

¡¡¡¡A. Yes£¬he isn¡®t. B. No£¬he is. C. Yes£¬he¡®s. D. Yes£¬he is.

¡¡¡¡( )5. What are the students doing in the classroom?

¡¡¡¡A. They are walking there. B. They are doing their lessons. C. They are helping their teacher

¡¡¡¡D. They are good friends of Jack.