第六部分　完形填空　(30分)
根据短文在空白处填上适当的单词，该单词的第一个字母已经给出。
Electricity　is　such　a　part　of　our　everyday　lives　and　so　much　taken　for　g____46_____　nowadays　that　we　rarely　think　twice　when　s____47____　on　the　light　or　turn　on　the　radio.　At　night,　roads　are　brightly　l____48_____,　enabling　people　and　t____49____　to　move　freely.　Neon　(霓虹)　lighting　used　in　a　s_____50____　has　become　part　of　the　character　of　every　modern　city.　In　the　home,　many　labour-saving　devices　are　p_____51_____　by　electricity.
Even　when　we　turn　o______52____　the　beside　lamp　and　fast　asleep,　electricity　is　working　for　us,　driving　our　refrigerators,　heating　our　water,　or　k_____53____　our　rooms　air-conditioned.　Every　day,　trains,　trolley-buses　and　trams　take　us　to　and　from　work.　We　rarely　b____54____　to　consider　why　or　how　they　run-until　something　goes　w____55____.