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Situation 1. at the cinema.

This is the situation Mika is at the cinema with two of his friends and they already taken (the or no particle) tickets online and but.. they have to get
back /redeem/pick up)the tickets from (the/a) self-ticket machine.

Mika: Did you book the tickets of Harry porter3 that we mentioned?

Jhon: Sure. I thought it must have been already booked up, you know this movie is so popular and but I found a few tickets left/ it turned out there were (the) tickets left. I made it!

Clair: Well-done, fellow! anyway I am quite thirsty. Could we have cups of coke?

Jhon. Yes, but we need to (get/ back/redeam/pick up) the tickets from a ticket machine. where is the ticket machine?

Mike: I am (looking around/look about)the cinema(or theater). oh there it is!

Clair: where?

Jhon: oh I found it too! beside the ticket desk! Hurry. the movie starts 10 minutes later(we have only ten minites left before it starts)

Mike: I am going!!

and three of them runs to the machine and take the tickets from the machine.





This is what I wrote for practicing and I need your corrections and suggestions.
help me nn

Artical and preposition are the most difficult concepts of(in) English grammar for me to understand.