A． downstairs     B． discovered       C． answered      D． invitation     E． advantage

Everything went black! All the lights in our flat turned off， including the TV． Mum took out the candles and Dad went to see what was going on． One（1） 　　of living in a tall building is that you always have help nearby． So I went to our next﹣door neighbour， Mr．Smith． With a candle in his hand， Mr． Smith（2） 　　the door． Uh﹣oh! He didn't have lights， either． I（3） 　　that all the buildings in our neighbourhood were dark． Our neighbours went （4） 　　and began chatting outside． They were not worried at all．