before you enter the teacher's office,you should k____ on the door

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beforeyouentertheteacher''soffice,youshouldk____onthedoorbeforeyouentertheteacher''soffice,youshouldk_

before you enter the teacher's office,you should k____ on the door
before you enter the teacher's office,you should k____ on the door

before you enter the teacher's office,you should k____ on the door
knock

knock 敲门

knock on the door - 敲门