We have gathered nearly 100,000 quilts, ___ up to half have gone to the flood-hit areas.
I was wondering what to do and______Mr. Wang came in.
David jumped___to get the first___the beginning of the sports.
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.