21. A. put B. back C. set D. take
20. A. ignored B. observed C. amazed D. disturbed
19. A. supposed B. realized C. hoped D. pretended
18. A. careful B. tired C. fond D. sick
17. A. shy B. awkward C. friendly D. elegant
16. A. crazy B. curious C. concerned D. cautious
15. A. naturally B. certainly C. normally D. surprisingly
14. A. got B. kept C. noticed D. imagined
13. A. spring B. summer C. autumn D. winter
12. A. though B. because C. unless D. until