I usually spend two hours ______ books every day.

近年来，北京、广州、长沙、东莞等地相继召开调整水价、阶梯电价、出租车价等听证会，引起了社会各方面的高度关注。公众除了关心价格调整外，还对听证会的方案设计、人员选择、程序规范等提出了不少意见。实行社会听证制度有利于（    ）

①决策者了解民情、反映民意、集中民智      ②保证公民对社会公共事务的管理权

③促进公民对决策的理解，提高公民执行决策的自觉性  ④增强公民的社会责任感

解下列方程组：$\left\{\begin{array}{c}3x-\frac{1}{2}y=1\\ 2x+y=2\end{array}\right.$

    Hi, everyone. I'm glad to show you around our city.

Now we are standing at Qingnian Square. ____ It is the white building over there. And it's on Changqing Street. Next to the bank is a bookstore. Many people go there to buy books. Go along Changqing Street.____. It is at the end of the street. Then turn left into Hengshan Road, and our school is on the right____. We sometimes walk along Hengshan Road to go to the swimming pool after class.____ Oh, there is a small river outside the city. ____ It is great fun.

从A, B, C, D四个选项中选择恰当的句子填入文中空缺处，使内容完整，正确。