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I. Fill in the blanks—Complete the following sentences with words from the readings.
1) Sometimes e _ _ _ _ _ _ weather can be dangerous.
2) It is important to m _ _ _ _ _ _ food before we digest it.
3) Some animals have to eat f _ _ _ _ _ _ _ _ in order to survive.
4) To t _ _ _ _ _, we need to eat healthy food.
5) Hurricanes have a lot of s _ _ _ _ _ _ _ clouds.
II. Answer the following questions.
1) What do you think would happen if there was no ozone?
2) Why is the digestive system important for us?
3) What kind of disasters can be caused by storms?
4) What are the most common gases in the atmosphere?
5) When do cells use energy?
III. Opposites—Find words in the readings that have the opposite meanings as these ones.
1) active: p _ _ _ _ _ _
2) farthest: c _ _ _ _ _ _
3) liquid: s _ _ _ _
4) giant: t _ _ _
5) absent: p _ _ _ _ _ _