The discovery was made after years of________ research and massive efforts.

Mark the letter A, B, C, or D on your answer sheet to indicate the best arrangement of utterances or sentences to make a meaningful exchange or text in each of the following questions.

a. Before that, however, you can watch Lucas Wilson preparing some traditional Polish dishes.

b. But now, here's the eight o'clock news.

c. Good evening. It's eight o'clock and time for tonight's news.

d. If you don't have the energy for that, then stay on this channel for Quiz Challenge with teams from Manchester and Oxford competing in the final.

e. If you're staying up late tonight, then you can catch a repeat of last Saturday's Dancing programme. 

Working in the emergency room of a major hospital is highly________work.

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. (3.0 point)

The way he solved the problem filled me with________.