_________the fact that his first experiments had failed, Prof. Smith persisted in his research.
My money is ________, so I have to call my parents saying that I am missing them.
Riding a bicycle can be fun. But ______ you ride a bike to work, and then there isn’t one to ride home?
People often have this belief _______ development is bad for the environment, but this does not have to be true.
Our goal is to make higher education available to anyone who is willing and capable ______ their family background and financial situation.
Joining the firm as a clerk, Peter got rapid promotion, and ______ as a manager.