Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. 1) Neil Armstrong was the first person to set foot on the surface of _____ . А. а B. the C. an D. (no article) 2) At the end of the race, he was exhausted and collapsed _______ the ground A. above B. on C. in D. at 3) Have you finished _______ the homework the teacher gave us last week? A. to do B. did C. do D. doing 4) If I _____ money now, I would buy a cellphone. A. would have B. had C. have D. had had