题目内容
15. Energy is _________ makes things work.
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16. One of the men held the view __________the book said was right.
17. I think that this meal was well worth ________ was charged for it.
18. Do you think the reason ________ he gave is believable?
19. Although he knew little about the large amount of work done in the field, he succeeded ________ other more well-informed experimenters failed.
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