10. an emergency arise, call 911. A. Should B. If C. Will D. Were 11. Nowhere in the northern section of the United States for growing citrus crops. A. is there suitability of the climate B. where the climate is suitable C. the climate is suitable D. is the climate suitable 12. Only after she had finished the course did she realize she a wrong choice. A. had made B. has made C. had been making D. was making 13. Never him stand on the deserted station platform. A. will I forget to see B. I will forget to see C. will I forget seeing D. I will forget seeing 14. The instructor blew his whistle and A. off the runners were running B. off ran the runners C. off were running the runners D. the runners runs off 15. Seldom far enough north to disturb South Pacific shipping lanes. A. Antarctic icebergs will move B. will Antarctic icebergs move C. will move Antarctic icebergs D. move Antarctic icebergs will 16. will China be the first to use nuclear weapons. A. At any time B. At no time C. At a time 17. He listened so attentively that not a word A. he had missed B. he missed C. he didn't miss 18. We spent nearly 3 hours waiting outside the station, then out A. the star came B. did the star come C. came the star 19. The African killer bees could not be handled safely, nor 20. Down when he was passing under the tree.