They spent the afternoon _________ in the street, not knowing what to do.
As time went on, the police _______ their search for the _______ student.
This situation ________. Which of the following is WRONG?
I don't know the reason ______ you were absent from the meeting, but I'm sure someone will tell me the reason ________ you haven't told me.
Mr. Green has two sons, and one of ______ is working as a bus driver now.
Harry Potter, for _____ life had once been very difficult, achieved great success and finally beat Voldemort.