Rewrite the following sentences in the passive. 1. The exhibition displayed

Rewrite the following sentences in the passive.

1. The exhibition displayed exhibits from 40 participating nations. Exhibits were displayed from 40 participating nations by the exhibition.
2. Participants hold business talks, negotiate transactions and sign contracts. Business talks are held, transactions are negotiated and contracts are signed by participants.  
3. Fairs and exhibitions give visitors a good idea of the countrys way of life. Visitors are given a good idea of the countrys way of life by fairs and exhibitions.
4. Companies and firms from Belarus will present a great part of the exhibits. A great part of the exhibits will be presented by companies and firms from Belarus.
5. They have traditionally regarded Belarus as an agrarian country. Belarus has traditionally been regarded as an agrarian country by them.
6. Groups of firms organized several exhibitions of Chinese merchandise. Several exhibitions of Chinese merchandise were organized by groups of firms.
7. Representatives from nearly 50 large-scale and private firms attended the exhibition. The exhibition was attended by representatives from nearly 50 large-scale and private firms.