__Only___by keeping down costs will Power Data hold its advantage over other companies.
倒装句：且keeping down costs 与Power Data hold its advantage over other companies为因果关系.四个选项中只有only合适.相当于汉语的“只有...才能.”
第二题：
Captain Scott’s example__inspired_____them with the determination to reach the South Pole on foot .
根据单词意思即可排除respected和admired,那么就看是选inspired还是prepared.
根据以下介词搭配：
prepare for 为...作准备
inspire sb.with sth.使某人产生某种感情; 激发某人的某种感情