用所给单词的正确形式填空

1. Those poor children need somewhere             ______ (live).

2. You should protect the children from ______ (catch) cold.  

3. How long does it take you               ______ (walk) 50 meters?

4. That easy chair takes up too much ______ (room).

5. Something serious is ______ (happen) to me.

高处焊割作业时，脚手板上、下坡度不得大于1∶2板面要钉防滑条，脚手架的外侧应加围栏防护。