1. conduct; experiments;2. proved　 3. control 4. electric 5.. shocking 6. conclusion 7. fasten 8.advantage 　9.. charged　 10.tore　 　

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1. saluting 2. generation 3. principles 4. gifts　 5. respect 6. invitation　 7. purpose 8. . celebrate 9.lighted 10. ancestors

15

explained　 2.author　 3.diamond; necklace 4. mystery 　5. outline　 6. mosquitoes7. debts　 8.recognized 9.lecture　

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7. ripe 8. function　　 9. digests　 10. tasty

14

1. energy　 2. diet　 3. mineral 4. mixture　 5.examine　 6. balance

10.　 The tides(潮汐) are caused by the a_______(吸引力) of the moon for the earth.

13

9.　　 Stephen William Hawking is disabled, but he is a g_____ in the field of physics.

8.　　 Three people were trapped on the island. A _________(直升机) was sent to rescue them.

7.　　 It was the heavy rain that p_______ us from getting here in time.

6.　　 How many _______(火箭) have you seen in the museum?

5.　　 Though he is young, he has a large c________ of stamps. There are over one thousand!