---How’s that? Who broke the glass?---Well, it ______ me. I was doing my homework the whole evening.
He made up his mind to devote all he could _____ his spoken English before going to college.
We live in a society ______ there is a great deal of debate about competition.
The fact ____ ancient Greek civilization had a great influence on Western culture is known to many people.
---_______ the farmers discovered the entrance to the secret cave in the valley? --- Totally by chance.
__________ he does has nothing to do with me.