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"How old" Question Word and "am , is, are"


Fill in the blanks with the am, is, are
How old they?
How old the Internet
How old this building?
Do you know how old I ?
How old your sisters?
How old the Universe?
How old grandma?
How old John McCain?
How old you?
How old the students?
How old your computer?
How old that Volcano?
How old your mother and father?
How old she?
How old that tree?