The correct pairs are AF, BE, and CD. AF - We need a base form verb to come after the infinitive TO given in A. The base form verb PASS in F is the correct match here. The sentence talks about how Siegfried Fink created transparent wood by bleaching away the pigments in plant cells and then published his technique for doing this in a journal. "By bleaching away the pigments in plant cells, Siegfried Fink managed to create transparent wood, and he published his technique in a niche wood technology journal." BE - The part of speech used in B before AND is a noun, PEOPLE; therefore, the part of speech used after AND should also be a noun. The noun EVENTS given in E is a suitable match here. The sentence seeks to convey that continued and shared attention to people and things is helpful in shaping identity. "Continued and shared attention to people and events is important because it can help shape identity." CD - We need a base form verb to come after the infinitive TO given in C. The base form verb ENCOURAGE given in D is the correct match here, as the sentence seeks to convey that the scientific community can and must make more efforts to encourage better discussion on specific projects. "The community, from individual researchers to institutions, can and must do more to encourage more meaningful, transparent engagement and discussion on specific projects." Thus, C is the right answer.