9．During some tedious hours of a space shuttle（航天飞机）flight，an astronaut passed some time（61）tring（try） to find his phone．As the spacecraft orbited（环绕…运行）Earth，the astronaut peered through the shuttle's windows to the distant world far below．Eventually，he （62）found（find） it-the twinkling lights of the city（63）wherehe lived．What a thrill!It was （64）extremely（extreme） comforting to see home when he was so far away．
On the next orbit，he looked out of the window again．This time the entire region around the city felt like home．On the orbit after that，he only had to look for his country（65）to feel（feel） at home，then only at the continent．Eventually，the astronaut saw the entire Earth（66）ashome sweet home．
The astronaut comprehended a simple yet important idea-all of Earth is our home．But lately we inhabitants haven't been too kind to our home．In fact you might say our home is in need of substantial repair．Many of the problems facing the planet come down to one vital factor-our quest（寻求）（67）forenergy．This book explores how the use of energy（68）affects（affect） the environment．Yes，our Earth is （69）loaded（load） with problems，but there are（70）solutions（solution），too．
