读下左图“我国南方某地区河流分布示意图”及下右图“南方部分地区河川夏季平均径流量占年平均径流量百分比示意图”，回答下列问题。

下列都属于器官的一组是（  ）

①臀大肌   ②口腔上皮   ③股骨   ④皮肤   ⑤血液    ⑥软骨．

根据句意，用所给单词的适当形式填空。
____ He was so tired that he stopped ________(have) a good rest.
____ The girls are old enough, they can take care of ________ (they).
____ Next Thursday is my brother's _______ (twelve) birthday.
____ There are a few _________ (different) between the twins.
____ We must be __________ (care) when we cross the busy street.
____ ______ ______ (事实上) , water covers most of the earth.
____ Kangkang is ______ his mother ______ (带…参观) his school.
____ Taiwan ______ ______ (属于) the PRC.
____ After many years'hard work, her dream ______ ______ (实现) at last.
____ The boy ______ ______ (迷路) and cried on the street.