实施计划生育是我国一项基本国策。分析下表，完成下列要求。

结合材料，从“求索真理的历程”的角度，分析我国计划生育政策是怎样变化发展的。

若$a=2^{0.5},b={\log }_{2}0.5,c={\log }_{2}1.5$，则（   ）

请根据句意从方框中选择合适的单词，并用其适当形式填空，使句子通顺。

____ This shop sells all kinds of    ▲   from different countries.
____ I hear that her uncle has bought a new flat in the city centre    ▲   .
____ Jack won the    ▲   prize in the school reading contest and he felt very excited.
____ He had to make a    ▲   between staying with his parents and going abroad. 
____ You know Mike’s hobby is playing football, but    ▲   is collecting stamps.