2. 通过用不同的水稻进行实验，他发明了这种杂交水稻。 (by+v.-ing)

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　　3. 他声称去过世界上许多地方。 (claim)

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Ⅴ. Translate the following sentences into English.

1. 这条河在这儿只有350英尺。 (narrow)

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12. We must learn constantly to 　　　　　the rapidly changing world.

11. The sun 　　　　　the dark clouds, promising better weather.

10. It is a vast sea with a few small islands 　　　　　above the water.

9. The village is 　　　　　from the outside world and it receives almost no visitors.

8. If you are 　　　　　a higher post in the company, you must work hard.

7. The tourists complained to the local police that they had been 　　　　　at some scenic spots.

6. With time going on, those old customs 　　　　　many years ago.

5. There is a mystery (疑团) we need to 　　　　　before the meeting begins.