这个练习的目的是帮助学生通过填空题的形式来加强对零条件句的理解和应用。以下的句子需要你用正确的形式填入空缺处，以完成零条件句的结构。请认真阅读每个句子，并在括号中给出的提示词的帮助下选出合适的词填入空白处，完成这些英语零条件句的练习。
零条件句英语语法练习一
If you mix red and blue, you get *purple* (color).
When water reaches 100 degrees Celsius, it *boils* (verb).
If you cut onions, you often *cry* (reaction).
People *die* (certainty) if they don’t breathe.
Ice *melts* (reaction) if you heat it up.
Cats *chase* (activity) mice when they see them.
When you drop an apple, it *falls* (motion) to the ground.
If plants don’t get water, they *wither* (result).
Babies *cry* (action) when they are hungry.
If it rains, the grass *gets* (becomes) wet.
When you press a doorbell, it *rings* (sound).
If you don’t water flowers, they *die* (consequence).
Cars *stop* (motion) when the light turns red.
When ammonia and bleach mix, they create a *dangerous* (adjective) gas.
If you cool water to 0 degrees Celsius, it *freezes* (change).
零条件句英语语法练习二
If you touch a fire, it *burns* (reaction).
Water *evaporates* (change) when it’s heated.
When you ring a bell, it makes a *sound* (noun).
Birds *fly* (action) south for the winter.
If humans go too long without sleep, they become *tired* (condition).
When you mix sugar in tea, it *dissolves* (reaction).
Your shadow *appears* (action) if you stand in the sunlight.
If it is summer, the days are usually *longer* (duration).
When iron is exposed to moisture, it *rusts* (change).
If you press on your skin, it *turns* (reaction) white for a moment.
When you breathe in oxygen, your lungs *expand* (movement).
If the soil is dry, plants *struggle* (growth) to grow.
Electronic devices *function* (operation) when they are plugged in.
When a sponge is squeezed, water *comes* (movement) out.
If there is a thunderstorm, dogs often *get* (reaction) scared.
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