连一连，读一读。

小河____            绿茵茵

天空____            黑乎乎

树木____            碧澄澄

太阳____            红通通（tōnɡ）

泥土____            蓝湛湛

根据句意，从方框中选择合适的单词或短语，并用其适当形式完成句子。                      

(1)Designs for the new gym will be ____  in the library. 
(2)Jim ____  his father. They are both clever and a bit quiet.
(3)I was waiting for the school bus but it didn't come. Then I ____  it was Saturday.
(4)Beijing is cold this time of year. You need to ____ warm clothes if you go there.
(5)Don't forget to ____  the door if you are the last one to leave the classroom.

下列省区中，水土流失较严重的有（    ）

  ①陕西②山西③黑龙江④西藏

如图，在正六边形ABCDEF中，△BCD的面积为4，则△BCF的面积为（　　）