Using all 26 letters of the alphabet, it is possible to fill in the blanks in the following manner:
First, pay close attention to the instructions. We must not use the same letter twice, which means that, for instance, the word "bordar" would be incorrect for number 9 since it repeats the letter R used in "bargain".
Second, look up the word to see if it a possibility. For example, in the end, we were left with C and X to complete number 9. After looking it up, we confirmed that "boxcar" is a real word.
Always start with the easier ones. For example, number 7 is a word we can easily complete since "pumpkin" is quite common in daily language.
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