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Precede adjectives (or adverbs) in the superlative degree by the and follow them by of or in.
Don't use for in the sense of about. The chief use of for is to convey the idea of being in favour of. If we say that the teacher spoke for bad habits it's like saying that he/she spoke in favour of bad habits!
Use for if the actual sum is mentioned, use at if the actual sum isn't given.
If the weight or measure follows the price, use at with the actual sum: That velvet is available at £5 a metre.
We use in to describe the physical location of something as part of a larger thing or place. We use at when we're talking about an address, a public place or building (a bus stop, the Post Office, the library etc.) and cases in which the location is irrelevant but what we do there is what matters (school, the dentist, dance class etc.)