21. With the wind ______ so hard, the roof can be torn apart any time. (A) blowing (B) blow (C) blown (D) be blown

31. What is the main idea of this article? (A) J.M.W. Turner is the greatest painter in English art history. (B) This iconic painting's message might, in fact, contradict Turner's true intentions. (C) The HMS Temeraire was the most important ship during the Napoleonic Wars. (D) Steam-powered technology was universally disliked by artists in Turner's time.