Instead of typing the question exactly as it was posed in your homework or schoolbook, it would be useful if you gave us all the details. We don't know what you are doing, we don't jnow what you have just read. We don't even know what subject you are studying... it could be German or Swahili for all we know - you have given us no information - not a clue!!!!
I gather from the "2" at the start of the question that this is the second question in a comprehension test.
What idiom? It is probably the one mentioned in question 1.
It is just an idiom and has no history.
Meaning he will help you out.
Palestinian and Persian
food
The origin of the idiom finger in every pie is unknown. The saying means being involved in a lot of things or knowing about a lot of things.
To be exposed
Advertising
Origin "up a storm"
No
That's not an idiom - it means exactly what it says - there are twelve months in a year.
It is a slang term from the 1930's, origin not known
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affrica (iraq
To hope for the best
It is just an idiom and has no history.
Meaning he will help you out.
Palestinian and Persian