★ Gerund and Infinitive
A huge fossil turtle is the latest species …………….. the ranks of super-reptiles that are now known …. in ancient Colombia.
A. joining / having lived
B. to join / to have lived
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Scientists ………….. at Stanford University School of Medicine in the US have invented an implant that could help the blind ……………. .
A. working / to see
B. to work / seeing
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