The story took place in Europe in the days before automobiles __ everyone used horses.
. As there is less and less coal and oil, scientists are exploring new ways of making use of ______ energy, such as sunlight, wind and water for power and fuel.
. It seems that living green is______easy and affordable. A small step masks a big difference.
-- Do you think it's a good idea to make friends with your students?--______, I do. I think it's a great idea.
. The system has been designed to give students quick and easy ______ to the digital resources of the library.
. Americans eat______vegetables per person today as they did in