27. In frigid regions a layer of permafrost under the soil surface prevents water from sinking deep into the soil, and so the water ______ the land, helping to create bog and ______ conditions.
A. freezes, tropical
B. parches, marsh
C. inundates, desert
D. aerates,jungle
E. floods, swamp

28.
Although the bystander's account of the car accident at first seemed ______ , the police officer was surprised, on further investigation, to find that it was ______ .
A. dubious, erroneous
B. incongruous, inconsistent
C. implausible, correct
D. logical, pertinent
E. probable, coherent

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