Change the following sentences into one of the Past forms, paying

Change the following sentences into one of the Past forms, paying attention to the Sequence of Tenses.
1. He says they are going to start exporting to Japan next year.
2. I know that his overseas trip was a success.
3. We suppose that exports are slowing down.
4. She says their company will be 100 years old next year.
5. He also explains how his company has performed in recent years.
6. They say that economists predict the increase of interest rate.
7. He says that Shell launched a new advertising campaign.
8. The workers claim that they are not earning enough.
9. She says that working conditions in Britain are regulated by legislation.
10.He is sure that there are several competing companies entering the market