Answer:
A.
1. The prepostion for question one is "on".
It depends on the day.
2. The preposition for question two is "in".
I'm arriving in San Francisco at 2:40pm.
3. The preposition for question three is "to".
Paul invited me to dinner ages ago.
C.
1. The preposition for question one is "for".
What do you usually ask for if you go to a cafe with friends?
2. The preposition for question two is also "for".
Who do you think should pay for the meal on a first date?
3. to; about
Who do you usually speak to when you are worried about something?
4.The preposition for question four is "on".
Do you spend more money on clothes or on gadgets?
5. in; with
Do you think it's possible to fall in love with somebody without meeting them face-to-face?
