Because it is a national holiday today, you won't find many shops open

1.Because it is a national holiday today,you won't find many shops open
->It is
2.I moved to the front row so that I could hear the spokesman
->Because I couldn't
3.She enjoyed movie so much because it was really interesting
->Because of
4.The internet is sometimes dangerous because of viruses
->Because
5.I can't drive because of not having passed the driving test
->Because
6.Hard work leads us to success
->If
7.Be alert or your computer will be infected with viruses
->If
8.Without a great resolution ,that disable athlete won't win a gold medal
->If