Dear Li Lei,It is normal

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完成对话_______this coffee?Is it sweet?No,itisn't .It's_________

Isbitter---这是咖啡吗?甜吗?---不,它不甜.它是苦的.

ls this your pen?yes,itisn't 哪里错了?

yes,itisno,it,isn't

Is this your school---Yes,itisn'f那错了

Isthisyourschool---Yes,itis.