Нужна помощь в решении

1 When the temperature drops below 0C, water turns to ice.

2 If you like extreme sports, you will (love) ice climbing.

3 Unless he (trains), he won't be able to go ice climbing.

4 They always put on sunscreen when they (go) volcano surfing.

5 If you do (not have) a four-wheeled motorbike, you (can not go) quad

racing.

6 When iron gets wet, it (rusts).

Unless I try, I won't understand.

If the weather gets cold, we'll stay in.  

If I study late in the evening, I feel tired the next day.  

Unless my friends help me, I won't cope.

Snow melts when it is warmed.