I THINK IT IS MORE _____ IF WE USE ENERGY -SAVING BULBS .A. RELIAB...

51. - TRAC NGHIEM ANH 9 HKII 2
TRAC NGHIEM ANH 9 HKII 2

51. I think it is more _____ if we use energy -saving bulbs .

A. reliable

B. wasteful

C. economical

D. saving