将下列句子改为被动语态(英语):
1.Businessmen brought tea to the West in 1610.
2.What do people use mobile phones for?
3.The teather is keeping the pupils at school for a revision.
4.My mother was making cakes yesterday evening.
5.The people make history.
6.They were holding a meeting yesterday.
7.Works are making new products every day.
翻译完呀!!!