Joy, what happened to the plane? It ___ at midnight, but it didn’t land on the airport on time.
Do you enjoy _______ pictures outside?
Lao She is famous _______ his play _______ a writer.
—_______ do you talk to your teacher at the School Air? —Once a week.
A library with two hundred thousand books _______ to the school last year.
The customs in America are different _______ those in China.