When ___ comes to saving energy , big changes start with small steps , like turning off the lights.          

 A. that  B. this   C. it   D. one

When ____ comes to saving energy, big changes start with small steps, like turning off the lights.?

When ____ comes to saving energy, big changes start with small steps, like turning off the lights.?

A. that　　　　　 B. this　　　　　　 　 C. it　　　　　　 D. one

When _____ comes to saving energy , big changes start with small steps , like turning off the lights.

1. A.
   that
2. B.
   this
3. C.
   it
4. D.
   one