Correct the words.

This plate is made from recycled materials, aren't they?
1. You haven't heard about this invention, haven't you?
2 She isn't interested in environmental issues, does she?
3. He has invented a new smartphone app, didn't he?
4 They aren't going to reduce the price, will they?
5 That company was developing a new type of paper, was it?
6 You love TV programmes about wildlife, aren't you?