Emerson is making a claim that people often take natural phenomena such as stars for granted.
Hope this helps :)
A singular verb would be used with a singular noun (she, Bob, Jane, truck) while a plural verb would be used with a plural noun (they, cars, books).
For example "The truck drives away." Truck being a singular noun and drives being a singular verb.
Another example
"The cars drive away." cars being a plural noun and drive being the plural verb.
first one is (MAIN CLAUSE)
second one is (SUBORDINATING CLAUSE)
but i am not sure about the 3rd one
D. because Pilgrims is capitalzed since its a proper noun and thanksgiving is capitilzed too since its a proper noun too
The answer you picked is correct