Developing new technologies are time-consuming and expensive.

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• Some of my friends are good at English while other are good at Mathematics.

• Teddy Roosevelt demonstrated his competitive spirit and tireless energy in 1905 whenever he led the Rough Riders up San Juan Hill.

• Generally, Europe and Asia are regarded as being distinct continents, but they are simply vast geography divisions of the larger lad mass known as Eurasia.

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• Of all the art-related reference and research library in North America, that of the Metropolitan Museum of Art in New York City is among the largest and most complete.

• Building thousands of years ago, the ancient palace is popular with modern tourists.

• To everyone's surprise, it wasn't in Bristol which he made his fortune, although that’s where he was born.

• Mary and her sister just bought two new winters coats at the clearance sale.

• If you work hard, you would be successful in anything you do.

• Reading several books on that subject, Bill considered himself an expert.

• There was a gradual raise in the number of literate males and females in the lowlands.

• I think she will be suitable for the work because she has been working like a teacher for a long time.

• When many of my friends take a shower in the morning, I usually take one before bed.

• I enjoy reading the article that you told me about it yesterday.

• Mrs. Stevens, along with her cousins from New Mexico, are planning to attend the festivities.

• Unless there had been a heavy storm, the climbers will not have died.

• It was not until the end of prehistoric times that the first wheeled vehicles appearing

• She did not know where most of the people in the conference was from.

• Practicing his speaking English everyday, his hope was to get a good job in a foreign company.

• The Great Pyramid of Giza is said to have built over a 20-year period.

• In spite of my father is old , he gets up early and does morning exercise.