Einstein, known as a famous physicist, went to Gottingen to give a lecture at the (26) invitation of the mathematical physicist David Hilbertin 1915. He was particularly (27) for this visit because it would give him a golden opportunity to explain the intricate relativity to him. The visit turned (28) a great success, and he told one of his friends excitedly that he had convinced Hilbert of the theory of relativity.Amid all of Einstein’s personal worries at that time, a new scientific (29) would emerge. He was trying his utmost to find the right equations that would (30) his new concept of gravity, ones that would (31) how objects move (32) space and how space is bent by objects. By the end of the winter, he was (33) to find out the mathematical approach he had been pursuing (34) almost three years was incorrect. And now there was a fierce (35) Einstein discovered that Hilbert had (36) theories from Einstein’s lecture and would come up (37) the correct equations first.It was an arduous task at that time. Although Einstein performed better in physics than Hilbert, Hilbert was the better mathematician. So later Einstein (38) himself to (39) after equations, proofs, and (40) so that he could return to an earlier mathematical strategy and give as lectures to Berlin’s Prussian Academy of Sciences.His first lecture (41) on Nov. 4, 1915, and he explained his new approach during the lecture, (42) he admitted he did not yet obtain the precise mathematical formulation. Einstein was also (43) engaged in revising his equations to compete with Hilbert. Worried (44) being scooped(抢先) ,he sent a copy of his lecture to Hilbert. "I am curious to know whether you will make use of this new solution," Einstein noted with a touch of (45) 26().

A. lucky
B. solemn
C. gracious
D. grand