Выпишите предложения, в которых глагол-сказуемое употреблен в страдательном залоге.
1. We obtained the necessary information when we were analyzing our data. 2. They were explained how to solve this problem on a computer. 3. The result of this experiment will be of great importance for the whole research. 4. Coal has been mined on a large scale in this region. 5. Time will be saved if we use a computer. 6. Such a question cannot be answered at once.