Mrs. Black has three daughters. Sue is the ____ (young) of the three. She is ____(outgoing) than her two sisters. She always tells some funny jokes ____ (make) people laugh. At school, her teacher thinks that Sue is the ____ (hard-working) student and that she does thing the ____ (carefully).

    Sue has a dream she want ____ (be) a reporter. To achieve (实现) her dream, Sue makes a plan. First she decides ____ (join) the writing Club to practice writing. Second, she tries ____ (talk) with her penfriends in different languages. To meet more people and talk with them, Sue plans ____(work) in some public (公共的) places. I'm sure she will be one of the ____ (famous) reporters in the world. Good luck to her!

农作物在东北平原一年一熟，在海南岛一年三熟，导致这种差异的主要自然原因是（ ）

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纳米陶瓷

纳米陶瓷作为高新科技材料应用广泛．贴于“神舟七号”飞船外表面的“太空”纳米陶

瓷，具有永久、稳定的防静电性能，且有耐磨、耐腐蚀、耐高温、防渗透等特点．采用氧化锆材料精制而成的纳米陶瓷刀，具有金属刀无法比拟的优点：刀刃锋利，能切割钢铁等物质．

能削出如纸一样薄的肉片；硬度高，其耐磨性是金属刀的60倍；完全无磁性；不生锈变色，

健康环保；可耐各种酸碱有机物的腐蚀；为全致密材料，无孔隙、不沾污、易清洁．纳米陶瓷充分体现了新世纪、新材料的绿色环保概念，是高新技术为现代人奉献的又一杰作．

They______ instruments and sing songs.