John, look at the time. ______ you play the piano at such a late hour?
--- Will you go to her birthday party? --- Of course I will if ______.
Would it be ______ for you to pick me up at one o’clock and send me to the school?
When he was young, he used to ______ hard at his lessons.
Mary is very clever and ______ worth teaching, but her brother is not.Look, he is now ______ asleep in class.
--- Could you be so kind as to close the window? --- ______.