If you cool water to zero degrees, .....
If you touch the fire, ...
Green plants can't survive if ...
When Mary has time, ....
His parents get worried if Peter .....
They always feel good when they ....
She gets nervous when .....
When I get home late, ....
When John feels tired, he ....
If we take short showers, the electricity bill...
When it rains a lot, the city ...
If you turn the key, the door ...
If someone enters the building, the alarm ...
We always feel good when ....
When a bycicle speeds up, it ...
If you put food in a fridge, it ...
