М. М. Кутепова The World of Chemistry Мир

The correct answer is (b), so you should mark answer (b).

7. 
   In the early days of chemistry the compounds obtained from living things were not even thought of... in the laboratory.
   

1. 
   to be obtained c) being obtained
   
2. 
   obtaining d) obtain
   

8. 
   Organic chemistry... to be a very large branch of chemistry.
   

1. 
   is sure c) is unlikely
   
2. 
   is likely d) is certain
   

9. 
   The carbon chain ... practically any length, the number of possible hydrocarbons is enormous.
   

1. 
   is c)been
   
2. 
   was d) being
   

10. 
    The material for... organic chemicals used to be found in the sea.
    

1. 
   producing c) produced
   
2. 
   produce d) being produced
   

3. 
   But for the complexity of the molecules of natural organic polymers they ... the attempts to analyse their molecular structure until very recently.
   
4. 
   would have defied c) wouldn’t have defied
   
5. 
   would defy d) have defied
   

6. 
   ... these salts decompose.
   
7. 
   On being heated c) On heated
   
8. 
   Having heated d) Heating
   

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13. ... гаге antibodies, tests at room temperature should be included.

1. 
   After looking for
   
2. 
   Before looking for
   

3. 
   In looking for
   
4. 
   Being looked for
   

5.