15. When Madam Curie did the experiment again, she was more careful where she _____ a mistake.
32. ________ have the radio repaired,he’d like to buy a new one.
31. I tried to telephone you, but I couldn’t ____________.
30. They are shocked to find that in this town the traffic rules are not strictly ________.
29. ---Let’s make it next Monday or Tuesday if it’s convenient for you. --- _____ day is OK. I’m free all the time.
28. It is suggested that the project ______ until all the preparations have been made.