Variant 1 You could have come first and won the race if you … faster


I called her Mary instead of Martha … mistake



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20. I called her Mary instead of Martha … mistake.

A) at B) with C) for D) by


To see the big obstacle facing renewable energy, look at Denmark. It has some of the world`s largest wind farms. Yet because consumer demand for electricity is often lowest when the winds blow hardest, Denmark sometimes has to sell its extra electricity to neighbouring countries at low prices - only to buy energy back when demand rises, at much higher prices. Companies in Texas face a similar mismatch between supply and demand; they sometimes have to pay customers to take energy from their windmills and solar farms. In theory, the wind and sun could supply the US with all the electricity it requires. In practice, however, both sources are too unreliable to supply more than 20% of a region's total energy capacity. Beyond that point, balancing supply and demand becomes too very difficult. What is needed are cheaper and more efficient ways of keeping power in reserve so that it can be accessed when the winds are not blowing and the sun is not shining.


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