19. He was reading his book, completely ___ to the world. A. lost B. losing C. to lose D. to having lost 20. Don’t sit there ___ — come and help me! A. watch B. watching C. to watch D. to be watching 21. I found I could easily make myself ___ by ...
12. A) Open. C) Selfish. B) Reserved. D) Friendly. 13. A) They read a book. C) They stay quiet. B) They talk about the weather. D) They chat with fellow passengers. 14. A) She was unwilling to make friends with workmates...
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