Just someone to check this few (5) sentences. Thank you

1. If I had done my homework, I woudn't get an E.
2. I wouldn't have lost my mobile phone if I had had it in my bag.
3. If the weather hadn't been so bad, our house wouldn't have been destroyed.
4. I wouldn't have broken knee if I had had knee pad.
5. We would have had gas if the Russians hadn't closed the ventiles.
The last one is connected with situation in Europe (Balkan)
