3. Fill in the gaps with suitable prepositions of time:

a. Ritesh reached London .......... (in/at/on ) 8.pm last Friday.
b. I met him ..........(in/at/on ) Thursday morning (after/before/during)...........he left.
c. His flight was ......... (in/at/on) night so I couldn't see him off.
d. I first met him ........(in/at/on) the beginning of the year 2008.
e. We have remained in touch .......(since/ever since/from ) then.
f. There have been ups and downs in our friendship...................(for/during/in ) these years but we have sorted them out.
g. He made it a point to visit me whenever he was in town even it was ...............(for/in/during) a very short while.
h. The last time he came to my place was ....................(in/at/on) January 2010.
i.I remember that he had called me very early..............(in/at/on) the morning................(in/at/on) 4.30 am at the airport.