9. Most living things cannot live without (氧氣) .

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9.以藥片的形式   10.與....相比

11. 以光的速度12. 由于人口的快速增長

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Frank was a teenager living with his father. He had so many family rules t 1 he couldn t stand,so he left home. Because he couldn’t find a job,he had to make a 12 by begging.

Years later,his father was old,but he was still 13 for his son. He had been to every corner of the city. E 4 he went,he put up a big photo of himself and Frank on the wall. At the lower part of the photo,he w 5，“I still love you,my dearest son. Please come back home!”

One day,Frank saw one of the photos. The faces on the photo were familiar to him. “Is that my father?” He thought for a while and decided to go b 6 to see his father.

It was an early morning w 7 he got home.  The door was not locked. He rushed to his father’s bedroom. “It’s me!Your son is back home!” The father and the son held each other,full of happy tears (眼淚) in their e 8. The son asked, “W 9 is the door unlocked? A thief could get in. ” The father answered in a soft v 10 ，“Because I'm expecting your return. In fact,the door has never been locked since you left. ”

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6. 7. 8. 9. 10.

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4. The (重力) on Mars is only about threeeighths of that on the Earth.

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5. This pair of leather shoes is (for a particular purpose,person,etc. ) made for you.

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4.(重力) will be a problem for the settlers on Mars.

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3. The doctor told him to have a (sleep) pill before going to bed to help him sleep well.

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10. (science) are working hard to make the dream come true.

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2. 在某些方面，火星上的生活未必會(huì)好于地球上的生活。

life on Mars may not be better than life on the Earth.

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