Выберите правильный вариант.
1. Probably, (that’s why/due to) its geographical position and landscapes, Australia’s population is very small.
2. (Thanks to/So) the fact that Anna has a beautiful voice, the concert was a great success.
3. I heard a noise (so/because) I got out of bed and turned the light on.
4. I do it well (because/that’s why) I trained a lot.