________. (D)Р A) At first B) Firstly C) First of all D) FirstР20. It is estimated that by 2020 the concentration will be nearly twice ________ it is now. (A)Р A) what B) that C) as D) whichР21. He’s either a hero or a villain, ________ your point of view. (D)Р A) acting on B) insisting on C) keeping on D) depending onР22. Can you tell the ________ between poisonous mushrooms and edible varieties? (C)Р A) similarity B) relationship C) difference D) progressР23. Because I live in a ________ village, I regard my car as an essential. (B)Р A) nearby B) remote C) local D) greatР24. The defeated army had to _____ hastily from the field of battle. (A)Р A) retreat B) respond C) remove D) retireР25. He traveled a great deal ________ most of his friends. (C)Р A) as were B) as was C) as did D) did as
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