将下列句子改为被动语态（每空一词）
1 the boss makes the workers work for ten hours a day
the workers 4空 for ten hours a day by the boss
2 lucy didn‘t make the model planes
the model planes 3空 lucy
3 sam gave me some flowers this morning
some flowers 3空 me by sam this morning
4 my dather bought me a new bike
a new bike 3空 me by my father