After Yang Li Wei succeeded in circling the earth, _______ our astronauts desire to do is walk in space.
By the time the fire-fighters arrived, the fire had been put___by the teachers and the students.
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.