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1 modern electric and diesel locomotives work at higher speed
2 In the future the railway will raise the speed and weight of trains and the carrying capacity of the lines.
3 our scientists are solving this complex problem now.
4 Some years ago he railroad was the best means of transportaion
5 the laboratory assistant was fixing a new compter from 5 till 7 yesterday

1work-Present Simple Active2will raise-Future Simple Active3are solving-Present Continuous Active4was-Past Simple Active5was fixing-Past Continuous Active