用所给词的适当形式填空
①We don't have any ____ (lesson) on Sundays.
②The teacher is very busy. He often ____ (sleep) at half past eleven.
③ I can ____ (play) football, but Burt can't.
④What____ he usually ____ (do) after school?
⑤ You can't go to bed until (直到) you finish ____ (do) your homework.
