The answer to 1 is imagery because the description helps us to better see the thrush through its use of adjectives.
The answer to 2 is sight, because we see gray rather than feel gray.
The answer for 3 is "is" because "dictionary" is a singular noun, not a plural noun. There is only one dictionary.
The answer to 4 is "was" because "tourist" is a singular noun, not a plural noun. There is only one tourist.
The answer to 5 is "was" because there is only one Statue of Liberty. It is a singular noun.
Remember, the general rule for singular/plural nouns is that plural nouns are usually attached with an "s" at the end. Although there are exceptions, it helps with most nouns.
Awnser: Thoreau begins Civil Disobedience by saying that he agrees with the motto, "That government is best which governs least." Indeed, he says, men will someday be able to have a government that does not govern at all. As it is, government rarely proves useful or efficient. It is often "mistreat and unnatural" so that it no longer represents the will of the people. The Mexican-American War illustrates this phenomenon.
