11. What’s the quickest way of getting from here to the station? To complete this sentence, we need to use a superlative form of the adjective "quick" and a preposition. The superlative form of "quick" is "quickest," and the preposition that we can use here is "of." We use the superlative form "quickest" because we are referring to the fastest or most efficient way of getting from here to the station. The preposition "of" is used to show that we are referring to the quickest way out of all the possible ways. So, the completed sentence becomes: "What's the quickest way of getting from here to the station?" 12. Sue and Kevin have got three daughters, the oldest of whom is 14 years old. To complete this sentence, we need to use a superlative form of the adjective "old" and a preposition. The superlative form of "old" is "oldest" (when comparing 2 or more things), and the preposition that we can use here is "of." We use the superlative form "oldest" because we are referring to the daughter who is the oldest out of the three. The preposition "of" is used to show the relationship between the daughters and their ages. So, the completed sentence becomes: "Sue and Kevin have got three daughters, the oldest of whom is 14 years old." (This means that out of the three daughters, the oldest daughter is 14 years old.)