The lake is so polluted. A lot od fish die

2/ The lake is so polluted. A lot od fish die.
If.....
3/ I think you shouldn't play games so much.
If I ......
4. There was a storm last weekend, so they couldn't go camping.
........because ...
->>
5. Scientists can predict natural disasters accurately.
natural disasters .....
6.They built that resort five years ago
That ...
7.A typhoon hit Ca Mau Province in 1997
Ca Mau ........
8.Did the storm destroy many houses
Were.........
8. The rescue workers had freed the villagers before the typhoon hit