Tenses are very important for the correct meaning of the sentence. The blank in the given sentence "was", i.e., If he was more careful, he wouldn’t keep breaking things.
Tenses help to communicate the location and times of events. It is of utmost importance to make a sentence meaningful.
The correct word in the given sentence should be " If he was more careful, he wouldn’t keep breaking things."
Thus, "was" is the word that should replace the blank.
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