短文改错。

    Predict ____ the future can be very difficult. There are so many predictions what ____ never came true. Before 1929, there was not ____ sound in movies. The head of one of the biggest movie company ____ in the United States predicted that no one would want to see actors to talk____. Of course, he was wrong! In 1977, the head of the biggest computer company in the United States said, “No one would ____ want to have a computer in his and ____ her home.”  He thought that computers would never use ____ by most people, but most people have computers in their homes now. We never know what will happen at ____ the future, but we believe we shall live a better life than before if we work hardly ____ now.