By looking at a problem in as many ways as possible, creative thinkers can find solutions that would _______ remain invisible.
________ at the party, I found Tina seated alone in the front row.
--- Do you mind if I record your lecture? --- ________. Go ahead.
My chest _______ when I make a deep breath, doctor.
--- How can I use iPhone 4s? --- Just refer to the _________.
What I need is book that contains ABC of oil painting.