Подчеркните сказуемое в главном и придаточном предложениях. - вопрос №803032

1. it was announced that the cryogenic cable had been invented in russia. 

2. the operator asked if heat treatment would restore the correct structure. 

3. it had been discovered that some elements might have isotopes.

4. at first it was not clear whether new telephone satellite communication was reliable or not.

5. the specialist was asked why the carbon content was toohigh for the metal to be used without refining.

6. one should remember that the successes achieved by chemistry and engineering are playing quite a big part in our country s space researching.

7. we knew for certain why polymeric materials were becoming more popular and were being used more extensively.

8. mendeleyev was sure that the new elements would be discovered and would find their proper place in his table.

9. it is found that the mechanical properties of iron could be greatly affected by the presence of small quantities of other substances.

10. he is asked why the ketones strongly resembled the aldehydes in chemical behavior during the experiment.