Either of the options acceptable to me.
are
is

Which word best describes the tone of this excerpt from daly's sixteen

The development of new inventions in the field of space travel seemed rapid. how does the word rapid function in a sentence?

Which of the following is the original meaning of the word college? a. an independent institution of higher learning offering a course of general studies leading to a bachelor’s degree b. a building used for an educational or religious purpose c. a group of persons considered by law to be a unit d. a body of clergy, living together and supported by a foundation