I recommend using paper to jot down which verb makes sense where in each section, then conjugating it here. Just type your answer, no caps and you can put a ' after the word if there should be an accent - example: for monté you can type monte' - (or copy the accented vowels from a google doc). The key should grade correctly either way, as long as you indicate the accent if you don't type it. You can keep trying for a perfect score in the time allowed.

Type the preterite form of the verb that makes sense.
Type the preterite form of the verb that makes sense.
Type the preterite form of the verb that makes sense.
Type the preterite form of the verb that makes sense.
Type the preterite form of the verb that makes sense.
Type the preterite form of the verb that makes sense.
Type the preterite form of the verb that makes sense.
Type the preterite form of the verb that makes sense.
Type the preterite form of the verb that makes sense.
Type the preterite form of the verb that makes sense.
Type the preterite form of the verb that makes sense.
Type the preterite form of the verb that makes sense.
Type the preterite form of the verb that makes sense.
Type the preterite form of the verb that makes sense.
Type the preterite form of the verb that makes sense.
Type the preterite form of the verb that makes sense.
Type the preterite form of the verb that makes sense.
Type the preterite form of the verb that makes sense.
Type the preterite form of the verb that makes sense.
Type the preterite form of the verb that makes sense.