She has been waiting ___ the bus stop for 20 minutes., in, at, on, by, The meeting was postponed ___ Monday because of the storm., in, at, until, by, He is really good ___ solving difficult problems., at, in, on, for, I haven't seen her ___ last Christmas., for, during, since, until, The keys are hidden ___ the two books on the shelf., among, between, across, through, We usually travel ___ summer, but this year we're staying home., at, on, by, in, She walked ___ the room without saying a word., across, into, between, above, The movie starts ___ 8:30, so don't be late!, in, on, by, at, He managed to finish the project ___ the deadline., among, by, during, since, There was a strange silence ___ the conversation., during, between, until, across

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