By the time he was twelve, Edison ________ to make a living by himself .
I never thought of it before, _______ all that my parents had done for me for granted.
______ number of people, who have access to private cars, is on____ increase in recent years.
I sat next to a girl __________ name was Dianna.
We shouldn’t be ashamed of the way we look, ____________?
Upon ________ his studies, he started travelling in China.