I / SURE / THEY / BE / VERY HAPPY / BE / TOGETHER / 25 YEARSA

30. I / sure / they / be / very happy / be / together / 25 yearsA. I am sure which they have been very happy to be together for 25 yearsB. So I am sure of they have been very happy to be together for 25 yearsC. I am sure that they have been very happy to be together for 25 yearsD. That I am sure they have been very happy to be together for 25 years