Which one of the following is the most important factor in the language acquisition of L1 (First Language)?

Academic language is the oral and written language that students need NOT necessarily:

Choose the correct sequence for a 'Find your partner' activity to encourage speaking in an English language classroom: (K) Fold them into small squares, mix them well and put them into a bowl. (L) Each participant picks up a piece of paper and after reading it asks a question or gives a clue to find his/her partner. (M) List out pairs of matching items (e.g., historical figures, cartoon characters, or word combinations like bread & butter) and write them on separate pieces of paper. (N) The game is over when each participant has found his/her partner. (O) The participant who has the paper slip with the matching pair reads out his/her word or character.