---There’s someone knocking on the door. Who _________ it be?---It must be John. He promised to be here at 8:00.
The story sounds ___.
You look so tired,It's time that you ___
An idea ___ into my mind that we should go there by bus instead of on foot.
---You’ve made great progress in your studies of English, haven't you? ---Yes, but much___.
The hall __ we saw the film was very clean.