3. Choose the correct preposition in the sentences below: 1. The stores stay open (on, in) Mondays (until, for) 9:00p.m. 2. Did you meet Mr. Green (at, during) your stay in Savannah? 3. Is your birthday (in, on) April? Mine is (in, on) April 7. 4. Columbus discovered America (in, on) 1492. 5. I received my bill (to, in) the middle of the month.​