Prepositions are essential elements in English because they establish relationships involving time, place, direction, purpose, and duration. The correct choice of a preposition depends on the context and the grammatical structure of the sentence. Read the paragraph below and analyze the meanings expressed by the missing prepositions.
“The seminar will begin _____ 8:30 a.m. ______ Monday. Participants from different countries will travel _____ the conference center, and the organizing committee has been preparing the event _____ several months. Most of the presentations will be available _____ the institution's online platform.”
Choose the alternative that correctly completes all the blanks.