Xi’an was the last city ______ he visited in China.
It was after he had read the requirements _______ Mr. Black realized the task was too difficult to be finished.
The last bus _________ two minutes before I arrived at the bus stop. What a pity!
A new subway ________ in Changsha and it will be open to traffic when completed next year.
My parents always ________ great importance ______ receiving good education.
The film star wears sunglasses. ________, he can go shopping without being recognized by fans.