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back from Tianjin two days ago. A. came B. e C. is ing D. will e 10. Have you mended your shoes, Bob? Yes, I ____ them twenty minutes ago. A. mended B. had mended C. mend D. have mended 11. When _____ you ____ to learn to skate? Five years ago. A. did。 start 12. 3D films are not new, they first ______ in 1903. A. Appeared B. had appeared C. appear D. have appeared 13. His parents were worried that he ____ too much time chatting on line. A. cost B. paid C. spent D. had 14. The plane _____ after the heavy rain stopped. A. took off B. takes off C. will take off D. has taken off 15. Let’ s discuss the plan, shall we? Not now, I ______ to an interview. A. go B. am going C. went D. was going 16. Frank ____ a film if he’ s free next Saturday. A. see B. saw C. has seen D. will see 17. When ____ for Hong Kong, do you know? I’ m not sure. When he ______, I’ ll let you know. A. Will he leave。 leaves 18. When can I go to play basketball with my friends, Daddy? Finish your homework first, or I ____ let you go. A. haven’ t B. didn’