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