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I. Fill in the blanks with the words in unit 4.
Small clever animals, now (1)________ hands and feet, appeared and (2)________ all over the earth. They developed new (3)________ of growing food, hunting and moving around. As time went by they (4)________ the earth and have become the most important animals on the planet. But they are not (5)________ care of the earth very well. They are putting too much carbon dioxide into the (6)________, which prevents heat from (7)________ from the earth into space. The earth may become too hot for the lives on it. (8)________ life will continue on the earth for millions of years to come will (9)________ (10)________ whether this problem can be solved. II．Complete the following sentences with words in unit 4.
1. A __________(猛烈的) typhoon called Damrey attacked Hainan.
2. The ______________(冲洗) of photo films requires a dark room.
3. People used to think this fish is ________(有害的).
4. The trees are a _________(一片) of green to the eye.
5. I don’t quite get the ___________(窍门) of driving a car.
6. People e___________ fireworks to celebrate the Spring Festival.
7. We were d___________ to hear that you couldn’t come.
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