10 alternatives for each sentences , which to use?

Could you tell me which word to use please?

1 That's when I'm best/I'm my best player.
2 He called just/only to fold post flop.
3 Food fell on/onto the bed.
4 How many people do you have room for?/You have room for how many people?
5 I've never been in this much trouble finacially before./financial trouble before.
6 She knows my code but doesn't know which letters are in capitals and which in lower case.
7 If you going into a match with that negative frame of mind/with a negative mindset.
8 We live during/at night and sleep during the day.
9 You ask youself why its such a mess here/wonder why its such a mess.
10 I have nothing to gain in/from being your friend.

thank you