1. 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.