I. Запишите предложения. Выпишите из них сказуемые, определите их видовременные формы и залог. Переведите. 1. Improvements in mining methods have reduced many of the risks of rock falls.

2. The chief engineer was informed of the changes made in the production cycle.

3. Scientists of different countries were working hard to improve technologies for proper coal treatment.

4. The results of the experiment could not be relied upon because of some fault in the equipment.

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