Answer: at, under, near, from.
Explanation: a preposition is a word governing, and usually preceding, a noun or pronoun and expressing a relation to another word or element in the clause. From the given options, the prepositions are "at" (it indicates location: "we are at my house"), "under" (it indicates direction: "the book is under the lamp"), "near" (it indicates position: "the park is near the school"), and "from" (that can indicate direction or time: "she comes from Spain" or "the lecture was from 3:00 pm to 4:30 pm").