Last month, doctors used a 3-D printer to rebuild the face of a person ____ had a bad accident.
great fun it is to go surfing in weather!
It’s quite clever ________ you _______ out the problem.
My tooth hurts. I’ll have no choice but ___________ tomorrow.
We all know that Changjiang River is longer than ___________ in America.
These photos__________ me____________ the old days when I was young.