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　　7．Never expect to persuade him out of do that.

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　　8．I am glad we were able to make it the theatre on time.

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　　9．The explorers searched the source of the river.

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　　10．I persuaded him to think twice before deciding to quit school，but he didn't.

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　　【答案】　1.that→what　2.frightening→frightened

　　3．after→before　4.go→going　5.to→as　6.use→using　7.do→doing　8.it后面加to　9.searched后面加for　10.persuaded→advised

　　Ⅲ.阅读理解

　　About 97% of the world's water is salty and is found in our oceans and seas.But，as we can't drink sea water，how can it be important?

　　Every part of our seas and oceans contains an amazing number of animals and fish that live at different ocean depths.Most of the different species of animals and fish depend on simple plants for their food.These simple plants called algae(海藻)drift near the surface of the ocean and use sunlight to turn carbon dioxide and water into food and oxygen.In fact，the algae produce over half of the oxygen people breathe.How important sea water is!

　　Each plant or animal in our seas and oceans is an important link in a food chain.The algae are eaten in large amounts by microscopic animals，which are in turn consumed by larger animals.These food chains are delicately balanced.

　　The bad news about the food chains in the oceans is that they are under threat because of man.People once thought that the oceans were so big that it didn't matter if we dumped rubbish into them or caught huge quantities of fish and whales for food.But we now know this is not true and fish stocks in the oceans have started to drop.

Thankfully，the world is taking steps to protect the future of our oceans by introducing international agreements to protect marine habitats.Most countries have