Unless we protect the environment, we will destroy ourselves

1)
1. unless we protect the environment , we will destroy ourselves
-if
2 unless she is more hard-working , she will get low marks
-if
3 unless he listens to his parents , he will fail
-if
4 the began watching the movie one hour ago
-they have
5 he last cried ten years ago
- he has
6 this is the first time he went abroad
- he hasn't
she started driving 1 month ago
-she as
8 we began eating when it started to rain
we have
9 nam likes watching televison
-nam is
10 it's the first time that I have ever talked to the foreigner
-I have