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7 Read the sentences. Circle the correct verb form to complete each sentence.

1. The Grand Canyon has shaped Gas been shapeDby the once powerful Colorado River.

2. Now the great Colorado River is drying up / is being dried up.

3. About seventy percent of the water uses / is used to grow crops.

4. People in far-off cities, for example, Los Angeles, are using / are being used the water.

5. Miles of dried up river beds can see / can be seen now.

6. A lot of animals have not survived / have not been survived the dry conditions.

7. Climate change is also harming / is also being harmed the Colorado River.

8. In the next few decades, the amount of available water may reduce / may be reduced

significantly because of climate change.

9. What could do / could be done to save the river?

10. More water should conserve / should be conserved.

8 Complete the exercises.

A Complete the questions with the words in parentheses. Use the correct passive forms
of the verbs.

1. How many sharks __arekilled (kill) every year?

2. How many people SSCS S(attack) by sharks every year?

3. When CSC—C—CSSCthe Mega outth shark / discover)?

4. How many shark species SSCS S(threaten) by human activity?

5. Which part of a shark SSCS Sell) for food?

» A pregnant sand tiger
shark swims over coral.
Bonin Islands, Japan.

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LESSON