By the time the fire-fighters arrived, the fire had been put___by the teachers and the students.
_________on the main street, the market was busy yesterday.
They were surprised that a child should work out the problem _____ they themselves couldn’t.
--- You must obey every word of mine. --- _____ I don’t?
_____ the lecturer more clearly, I arrived early and chose a front seat.
---You have made great progress in your English study, haven’t you? --- Yes, but much _____ .