The key to ___ new ideas is to observe daily life carefully, and not to take things for granted.
30. Mr. Keller ______ forty cigarettes a day until he gave it up.
29. --- Do you know that man? --- Not really, just a nodding _______.
28. Please remember___wins you respect is not your background but your knowledge and virtues.
27. I find it astonishing that she _____ treat you like this in public.
26. Their work ______, all the experts went out for relaxation.