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I. Fill in the blanks—Complete the following sentences with the correct words from Lessons 1− 4.
1) Clouds have an i _ _ _ _ _ _ _ _ _ effect. They keep heat in.
2) It is important for some animals to h _ _ _ _ food.
3) Some snakes kill their prey by c _ _ _ _ _ _ _ _ _ _ _.
4) Animals that are d _ _ _ _ _ _ in winter are trying to save energy.
5) A l _ _ _ _ is a kind of home that is made by beavers.
II. Answer the following questions.
1) What are some different kinds of shelters for animals?
2) Why can't people live on Venus?
3) What are some different ways that animals adapt to winter?
4) What kind of animals live in wetlands?
5) What are some animals that live in dens?
III. Opposites—Find the opposites to these words in the readings.
1) active: d _ _ _ _ _ _
2) rough: s _ _ _ _ _
3) narrow: w _ _ _
4) shallow: d _ _ _
5) used: s _ _ _ _ _