[ Idioms ]

Scientists will break ___ in their search for new sources of energy.
a. up
b. through
c. out

Select your answer:
         


Random Topics:
Start x BeginCannon x CanonExpressing Wishes

How to use : Read the question carefully, then select one of the answers button.

Tips : If this page always shows the same questions, make sure you correct the question first by pressing the "check answer" button.