1.I knew neither his name nor his address, so I can't send the letter out in time.
2.Every time this kind of infectious disease occured, thousands of people will die.
3.Experts suggest that all the water should be examined in order to prevent this kind of situation recurring.
4.It seemed that the weather was the "chief criminal", but he would still stay at home so as to set off at any time.
5.Of course, it's right for you to be careful.