Improve the coherence of the following paragraph by adding transition in the blank spaces. Use the hints provided in parentheses to help you choose a transition. First, CDS brought digital sound into our homes. Then DVD technology brought digital sound and video and revolutionized the movie industry. Soon there will be ##1## (additional idea) revolution: Blu-ray discs. A Blu-ray disc will have several advantages. ##2## (list in order) it has an enormous data storage capacity. A single-sided DVD can hold 4.7 gigabytes of information, about the size of an average 2-hour movie. A single-sided BD, ##3## (contrast), can hold up to 27 gigabytes, enough for 13 hours of standard video. A ##4## (list in order) advantage is that a BD can record, store, and play back high-definition video because of its larger capacity. A double-layer BD can store about 50 gigabytes, enough for 4.5 hours of high-definition video. The cost will be about the same. ##5## (additional idea), a BD has a higher data transfer rate--- 36 megabits per second---than today’s DVDs, which transfer at 10 megabits per second. ##6## (result) a BD can record 25 gigabytes of data in just over an hour and a half. ##7## (conclusion) because of their large storage capacity and comparable cost, BDs will probably take over the market when they become widely available.