35. So mysteriously ______ missing that many puzzles wait to be solved.
------Why can she keep such a good figure? ------ She _________ great importance to regular exercise.
Safety in school has been of great concern because of frequent reports about accidents _______ students got injured or killed while in school.
In order to continue to learn by ourselves after leaving school, we must ______ learn how to study in the school now.
---- How long will it be ______ we know the result of the English examination?----- Perhaps in two or three days.
------ Bob failed in the exam again . ------ He _____ it ; he never worked hard .