Finding the ______look on the student’ s face, the professor felt _____about his explanation.
Such a problem is____difficult for a primary school student ___.
The railway was opened______traffic_______ April 4, 1985.
Ted has been absent_____class for quite some time.
He divided the sweets___the children who were divided ___three groups.
The pianist began to play and the girl in red began to sing ____the music.