1. At some point the Hello Kitty fever struck Taiwan. Hello Kitty related products were selling like hot cakes. Hello Kitty was all the rage.2. Bacon is a national obsession for its delicious taste and versatility in dishes.3. The bacon boom hit the U.S. in the twenty-first century for its delicious taste and easy preparation.4. Eating fast food is just a passing fad.5. Britain's booming housing market could be heading for a sudden crash.6. Subprime mortgage defaults greatly impacted the housing market boom and bust cycle.
 fever fad all the rage obsession boomfever 指可長可短的流行，fad 指非常短暫的流行，all the rage 指最新的流行，obsession 指迷戀，boom 指突然變的受歡迎的東西，如:Hello Kitty fever struck Taiwan = 凱蒂貓在台灣造成一股旋風The bacon boom = 對培根的熱愛The housing market boom = 房市掀起一股熱
1. 一股 Hello Kitty 的旋風2. 吃快餐只不過是個熱潮.
I have been wrcking my brain on this tough math question but I still cannot solve it.