根据所给提示，完成句子。每空一词，含缩略词。

小题1:The government cut the price of new houses in big cities last year. (改为一般疑问句)

________ the government ______ the price of new houses in big cities last year?

小题2:The Greens were watching TV at 7 o’clock yesterday evening. (对划线部分提问)

_______ were the Greens ________ at 7 o’clock yesterday evening?

小题3:Jeremy Lin joined Houston Rockets in 2012. (改为同义句)

Jeremy Lin has ______ _______ Houston Rockets since one year ago.

小题4:我相信总有一天，我会实现我的梦想。 （完成译句）

I believe my dream will ______ _______ one day.

由于太阳能具有安全、清洁、方便等特点，使得人们越来越广泛地使用它．已知某太阳能热水器的水箱受太阳热辐射8.4×10⁷ J，如果这些热量的50%被箱内200 L的水吸收，可使这些水的温度升高多少？