—Why do you look sad?—There are so many problems ________.

______ in the early 20th century, the school keeps on inspiring children’s love of art.

The boy was put into the prison for       of stealing a lot of knives. 

John is the only one of the students in the class who never _____ a mistake even when it is pointed out to him.

On returning home from school, Xiao Hong______ her MP4 and threw herself down onto the bed, ______ music.