15. A. dentist B. vacation C. teacher D. sister A В C D Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions. fifteen classrooms in my school. В. are 16. There A. have С. is D. has A В C D 17. Не to school with me yesterday. A. went В. go С. is D. goed A В C D 18. Lan is than me. A. the short B. shortest C. short D. shorter A В D 19. are you doing? A. Where B. What C. Which D. How many A В C D 20. Their house is more modern than A. mine B. me C. my D. you