**26. Answer: C**
Hop flowers are added to nearly finished beer to give it a bitter flavor while chicory roots are added to coffee to **eliminate its bitterness**.
Analysis: After “to” we need a verb in base form → eliminate.
**27. Answer: C**
Basically, science by its nature **involves** exploring the unknown.
Analysis: The subject “science” is singular, so the verb should be involves.
**28. Answer: A**
In 1968 the Peace and Freedom Party **nominated** Dick Gregory as its presidential candidate in recognition of his efforts to make the world a better place.
Analysis: Should use the verb nominated, not the adverb nominally.
**29. Answer: C**
Over ninety percent of the world’s countries depend on ocean shipping for most of **their trade** with other countries.
Analysis: After “most of” we need a noun phrase with possessive → their trade.
**30. Answer: B**
There are many amazing stories about how a cat can find **its way** back home after being left behind hundreds of miles away.
Analysis: Subject “a cat” is singular, so use its not their.
**31. Answer: D**
During the 19th century, more immigrants settled in Pennsylvania than in any other **state** except New York.
Analysis: With comparative, use any other + singular noun → state.
**32. Answer: B**
Water treatment deals with problems directly or indirectly **is concerned with** the removal of contaminants and microorganisms from raw water.
Analysis: Should be is concerned with to keep the grammar consistent.
**33. Answer: A**
**Both** mammals and reptiles share the basic skeletal structure of all vertebrates.
Analysis: Correct usage is both…and, not either…and.
**34. Answer: A**
The **news** from all over the world are reported through various means of communication to mass media, such as newspapers, magazines, radio, and television.
Analysis: Should use news (uncountable noun), not new.
**35. Answer: D**
The rotation of crops helps to distribute nutrients across the farm and control the **transmission of** diseases borne in the soil.
Analysis: Should be transmission of diseases, missing the preposition of.