Question

X. Open the brackets and put the verbs in the required passive form. Mind the tense and preposition. 1. The application of these mining methods often (to refer to). 2. The process of extracting lead from this ore (to objectd to) at the recent conference. 3. The statistical theory (develop) quite recently. 4. Objects with negative stability usually (to call) unstable. 5. These classifications already (to use). 6. Cooling often (to provide) by the circulation of water. 7. Some pressing problems (to discuss) at the symposium next week. 8. The new discovery (speak about) now. 9. The scientists understood that a more careful approach (to need) to realize their idea in future. 10. The explorers (to see) not far from the camp of the expedition yesterday.

Answer 1

1.are referred to.2.was objected.3.has been developed.4.are called.5.have been used.6.is provided.7.will be discussed.8.is being spoken about.9.would be needed.10.were seen.

Answer 2

1. The application of these mining methods is often referred to.
2. The process of extracting lead from this ore was objected to at the recent conference.
3. The statistical theory was developed quite recently.
4. Objects with negative stability are usually called unstable.
5. These classifications have already been used.
6. Cooling is often provided by the circulation of water.
7. Some pressing problems will be discussed at the symposium next week.
8. The new discovery is being spoken about now.
9. The scientists understood that a more careful approach was needed to realize their idea in the future.
10. The explorers were seen not far from the camp of the expedition yesterday.