Exercise: I know how I (spend) the money my father (give) me last Christmas.

[Maple_Leaf]

Please help me with this exercise^^
I know how I (spend) the money my father (give) me last Christmas. I (keep) it until now in my Post Office Saving Account. I (just see) a beautiful watch in a jeweller’s shop. I (go) to the Post Office tomorrow, and when I (draw) out the money, I (buy) the watch. Come this weekend, I (show) you the watch.
Thanks !!!!!!

[Kitosdad]

I know how I (will spend) the money my father (gave) me last Christmas. I (have kept) it until now in my Post Office Saving Account. I (have seen) a beautiful watch in a jeweller’s shop. I (am going) to the Post Office tomorrow, and when I (draw) out the money, I (shall/will buy) the watch. Come this weekend, I (will show) you the watch.
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If you need me, I'm here.

[Maple_Leaf]

thanks !
"I (am going) to the Post Office "
can i use " will" here ?

[Kitosdad]

I will go to the Post Office is OK.ML.
_________________
If you need me, I'm here.

[Maple_Leaf]

Many thanks, Kitosdad !