while we were reading books ,we ______ a loud noise outsideno one knew what ____ to the old man

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whilewewerereadingbooks,we______aloudnoiseoutsidenooneknewwhat____totheoldmanwhilewewerereadingbooks

while we were reading books ,we ______ a loud noise outsideno one knew what ____ to the old man
while we were reading books ,we ______ a loud noise outside
no one knew what ____ to the old man

while we were reading books ,we ______ a loud noise outsideno one knew what ____ to the old man
1.heard
2.happened