It would appear that you have 2 answers for some of the blanks? We HELP but do not DO the work for you. Here's a quick "run down" on the tenses. They make a story so colorful because one sets the background or paints the backdrop (the Imperfect) and one tells the action (the Preterit.)
For the Preterit, try to imagine a series of snapshots = / / / / / where each one has a beginning, a middle and an end. The verbs you have above in the Preterit = dio, tuvo, conocí, fui, compré, compraste. Here is the English cue of only one: compré = I bought, I DID buy.
For the Imperfect, try to imagine a movie camera rolling away = ~~~~~~, concentrating on the "middle" of something that obviously had a beginning, but as far as you know, never has an end! Here are the verbs you have above in that form: daba, tenía, conocía, compraba, iba. Translating one into English, look at the 3 English cues "compraba" = I (he, she, it = all the same form) WAS buyING, USED TO buy, bought. (that last English overlaps with the Preterit)
NOW, try again and choose more decisively.
Sra