Zero Conditional: if / when — facts, habits, scientific truths (A2)

If you heat water to 100°C, it ___.

If it ___, the streets get wet.

___ you mix red and blue, you get purple.

If I ___ too much coffee, I can't sleep.

If you don't water plants, they ___.

If you drop something, it ___ to the ground.

When she ___ nervous, she bites her nails.

If you ___ eat enough protein, your muscles don't grow properly.

If you freeze water, it ___ into ice.

___ you cut yourself, you bleed.

If bees ___ the scent of flowers, they fly towards them.

If you ___ a wound, it doesn't heal as quickly.

What ___ if you add salt to boiling water?

If the temperature ___ below zero, water turns to ice.

If you ___ exercise regularly, your fitness improves over time.