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The first cellphone was invented fifty years ago. The inventor of that phone, Martin Cooper, is now 94 years old. He has been ________ the “father of the cellphone”.

In the early 1970s, Cooper worked for American technology company Motorola. At the time, Motorola and other ________ were competing to create cellphones. Cooper made the first public call ________ a handheld telephone in New York City on April 3, 1973. The Dyna-TAC weighed about 1 kilogram and was 28 centimeters long.

He ________ the phone with his team at Motorola for over five months. They could only ________ on it for about 25 minutes. Cooper noted that such a call time was not a ________, because this phone was so ________ that you couldn’t hold it up for 25 minutes. Cooper said, “The only thing that I was worried about: ‘Is this thing going to ________?’ And it did. At the time, we had no way of knowing this was an ________ moment in history.”

Today, the phone allows us to do many things. Cooper said the progress of cellphones is sure to ________ long into the future. He thinks future phones will ________ our health at all times and batteries (电池) could even be replaced by human ________. He believes that one day, our phones might be small devices inside our ears.

Cooper has also expressed his ________. “We don’t have any privacy (隐私) anymore because ________ is now recorded someplace,” Cooper said. However, he said ________ that cellphones will continue to develop in ways that can greatly help humans.