将下列句子改为被动语态（英语）:要保证100%对哦!!!!!3Q)

1\Tea was brought to the West by businessmen in 1610.
2\What were mobile phones used for by people.
3\The puipls are being kept at school by the teacher for a revision.
4\Cakes were being made by my mother yesterday evening.
5\History is made by the people.
6\A meeting was being held yesterday.
7\New products are being made by workers every day.

1 The tea was brought to the West by businessmen in 1610
2What was mobile phones used for by people?
3the pupils is being kept at school by the teacher for a revision

一楼的第二题错啦.应该把"was"改成"were",因为phones是复数.
4.Cakes were made by my mother yesterday evening.
5.History was made by people.
6.A meeting was made by them yesterday.
7.New products were made by workers every day.