— Why on earth didn’t you answer the door? — I’m terribly sorry, but the telephone _______, too.
----- Where did you ______ our chemistry teacher? ----- It was in the supermarket ______ I saw him.
Yuan Longping makes ____ possible to produce more crops in the same fields with this special strain of rice
Please ______ the traffic regulations.
Only then ______ how much damage had been caused.
Before he came , I’d finished _______ the whole book.