________ I can’t understand is ________ he wants to change his mind.

(2013·高考湖南卷)You must learn to consult your feelings and your reason________you reach any decision.

_________ the internet is _________, I do not think it is a good idea to spend too much time on it.

In the global economy, a new drug for cancer, _________ it is discovered, will create many economic possibilities around the world. 

 Though having discussed it for long, they still haven't reached an agreement ________ they should pour more money into the project.