Answer:
1.I think Peter got the flu,so, I think he should go to bed. I don't think he should go to work.
2.I think I lost my cheque book and credit cards.
3.Tony got his driving licence last week and now, I don't think he wants to drive from London to Edinburgh.
4.I think my teenager daughter doesn't get out of bed untill noon.
5.I don't think I never have money!
6.Jane and Paul are only 16,but I don't think they want to get married.
7.I think I'm really fed up with my job.
8.I think my grandparents complain they don't go out enough. (My opinion, If I make a mistake, I am sorry.)