Ответ:
1. When people hunt, animals suffer.
2. Mom will be very happy if she passes the driving test next week .
3. If Andrei will have to work harder, the teacher will be happy with it
4. We couldn't go for a walk if it was raining
5. If you don't apologize immediately, I'll talk to you again
6. I will stay longer yesterday if it is the best party.
7. He will win a prize if he finishes the competition first.