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.

对三国两晋南北朝时期时代特征最准确的描述是(     )

世界上面积最大的洋是 (      )