Нужно вставить правильный вариант, помогите)
1)    
Sustainable future must ___ for the next generations.



A to be provided  
B provided   C be provided   D have provided



2)    
Wastes ___ into the atmosphere, water and soil.



A to be released  
B released   C is released   D are released



3)    
What would happen if we continue ___ fossil fuels at
present rate?



A to be consumed  
B consuming   C consume   D to be consuming



4)    
Relatively inert silicon is sure ___ a major material
used in solar cells.



A to be   B
be   C to have been   D ---



5)    
Scientists looked for the optimal way of ___ energy.



A obtaining   B
obtain   C obtained   D to obtain



6)    
The ___ pressure can cause serious fault of the
engine.



A increase  
B increases   C increasing   D to increase




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