In the following passage some words have been deleted. Fill in the blanks with the help of the alternatives given. Select the most appropriate option for each blank.
After a lesson on negative sentences, a pupil tells his teacher, "I ain't got no pencils." She corrects him immediately saying, "The correct way to say (1) ______ is, "I don't have any pencils". "We don't (2) ______ any pencils." "He (3) ______ have any pencils. They don't have any pencils. (4) ______ you understand?" asks the teacher. "No," the boy answers, astonished. "(5) ______ happened to all the pencils?"
Select the most appropriate option to fill in blank No.4.