By the time the fire-fighters arrived, the fire had been put___by the teachers and the students.
The stone on the river bank rolled under her feet; she was _____into the river,and she called out for help.
-What do you do yesterday afternoon?-I went to the bookstore,___ some books and visited my uncle.
Exercise is ______ as any other to lose unwanted weight.
-Do you think we can get there on time? -Yes,_______ the truck doesn’t break down.
The new machine,if _________ properly,will work at least ten years.