I never . . . . . . . . my temper on purpose, of course, but sometimes I just . . . . . . . ., though I always regret it afterwards.

Solution (By Examveda Team)

The present simple tense is used for habits, general truths, and repeated actions.

lose and explode are in the present simple tense, indicating that losing temper and exploding happen from time to time.

lost/am exploding is incorrect because it mixes past tense with present continuous tense.

have been losing/exploding is incorrect because it uses the present perfect continuous tense, which implies an ongoing action that started in the past and is still continuing.

were losing/have exploding is incorrect because it uses the past continuous tense with an incorrect form of present perfect continuous tense.

have lost/was exploding is incorrect because it uses the present perfect tense with the past continuous tense.

Therefore, the correct answer is lose/explode.