_________ many times, he finally understood it.
Mary failed the driving test again.If she ________ harder, she ________ the test easily.
I would have helped you, but I ________ really occupied the whole week.
The education program ________ combining brain work with manual labor is being widely spread throughout the country.
The sooner we students ________ to the new school,the better it will be _______ our studies.
With everything ________, he started the slide show.