在一次体育测试中，小芳所在小组8人的成绩分别是66，67，78，78，79，79，79，80，则这8人体育成绩的中位数是（　　）

原核细胞和真核细胞最明显的区别在于（　　　）

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.

下列句子中横线上依次填入的最恰当的一组词是（     ）

①我决定___________ 儿子，因为我伴同他的时日还长。

②月亮出来了，冷冷地，我不禁打了个__________  。

③这南方初春的田野，大块小块的新绿_________ 地铺着。