The first textbooks written for teaching English as a foreign language ___ in the 16th century.
Tom’s father burst out ___ when he saw Tom eating candy happily in the police refuge for lost children.
___ a teacher, he is strict with his students.
American people regard Abraham Lincoln __ one of the greatest of all American presidents.
Mr. Chang has been ___ monitor of the class.
The time __Mathilde had to go back home finally arrived.