9. The river is now seriously polluted. There were once many trees along its banks.

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D.用非谓语动词结构组合句子

8. Edison invented the light bulb. It is known to all.

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7. I am very grateful for Tom. He often helps me gladly.

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6. I know that student. His article has been published.

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5. Farmers once were looked down upon. Those days are gone.

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4. Environment protection is becoming more and more urgent. One example of it is the serious air pollution.

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3. He couldn’t go to college because his grades were too low.

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2. I will never forget the day. On that day I met you for the first time at the airport.

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1. Kunming is a beautiful city. There flowers and grass can be seen everywhere.

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14. We didn’t drive in turn, so you got so tired.(用虚拟语气句)

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C.用定语从句组合句子