The following question consists of a sentence(s) with one blank only. You are given six words as answer choices and from the six choices you have to pick up two correct answers, either of which will make the sentence meaningfully complete.

During the course of development, most economies ___________ substantial changes with large shifts in resources across the agricultural, manufacturing, and service sectors. 

A. Recuperate

B. Undergo

C. Imagine

D. Engage

E. Empower

F. Experience