Some place names have been changing over the years. For example, Jinling in ancient China refers to ________ is now called Nanjing.
Dr. Black is a professor of chemistry. _______, he is a famous writer.
The new invention may __________a lot of changes in our daily life.
It _______ them three years to build this road.
I wanted _______ you for your last letter.
He missed his mother very much and ________ crying.