Complete the sentence with the suitable preposition

II.               Complete the sentence with the suitable preposition

1.      He is going to meet her ……………….Christmas day.

2.      Jazz became popular in the United States …………..1920.

3.      The meeting started…………………9 o’clock.

4.      We have to wait for her ……………………15 minutes.

5.      He said goodbye to us …………….October 2009.

6.      I like watching stars ……………………..night.