[ Idioms ]

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

Select your answer:
     


Random Topics:
General KnowledgeFuture Continuous TensePast Perfect Tense

Next quiz: Grammar

It was the first time I … the Chinese food.

A. Tasted
B. Have tasted
C. Had tasted
D. Taste


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