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1、 They focus on keep their soil rich and free of disease.
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2、 At that time, hunger was a disturbed problem.
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3、 Dr Yuan searched for a way to increase rice harvest without expand the area of the fields.
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4、 Watch a family of chimps wake up is our first activity of the day.
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5、 The bridge (build) last year was designed Mr. Smith.
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6、 The building (build) next year will be our library.
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7、 The building (build) now will be completed by the end of this year.
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8、 It is well known that Zhai Zhigang is the first Chinese astronaut (walk) in space.
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9、 Mr. Green stood up in front of the 16-year-old boy, saying that he was not the one (blame).
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10、 (face) with so much trouble, we failed to complete the task on time.
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11、 Oil prices have risen by 32 percent since the start of the year, (reach) a record US $57.65 a barrel on April 4.
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12、 He hurried to the booking office only (tell) that all the tickets had been sold out.
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13、 Isn't it time you got down to (mark) the papers?
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14、 When asked by the police, he said that he remembered (arrive) at the party, but not (leave).
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15、 Smoking means (kill) yourself.
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16、It's necessary to be prepared for a job interview. (have) the answers ready will be helpful.
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17、 It took a long time for the connection between body temperature and illness (make).
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18、 As the twentieth century came to a close, the raw materials for a great national literature were at hand, waiting (use).
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19、 (complete) the program, they have to stay there for another two weeks.
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20、 Here's a new pair of shoes for you.
Thank you, but there's no need (buy) a new pair for me.