Evidence gained from observation and experiment is often used to _______ a scientific theory.
The newly-built cafe, the walls of __________ arepainted light green, is really a peaceful place for us, especially after hard work.
I have reached a point in my life __________ I am sup-posed to make decisions of my own.
Everyone has periods in their lives __________ everything seems very hard.
Gun control is a subject __________ Americans haveargued for a long time.
—Can you believe I had to pay 30 dollars for a haircut? — You should try the barber's __________ I go. It's only 15.