根据括号中给出的提示词，在横线上填入其合适的形式，以完成下方段落。
The ultimate test, in my child mind, for (1)______ (find) out the difference between black and white, (2)_____ (occur) one day in a bus station in Alabama. While (3)_____ (wait) with my parents at the station, I (4)_____ (study) the two water fountains (喷泉式饮水器) against the far wall. Side by side they (5)______ (stand). A big sign above one (6)______ (read) "whites only". The sign above the other fountain (7)______ (read) "colored only". I (8)______ (decide) that once and for all I would (9)______ (satisfy) my curiosity about the water fountains which always (10)______ (carry) the signs above them. Was the water (11)______ (color) in the "colored only" one, or did it (12)______ (taste) different? Since no one was (13)_____ (watch) me, I (14)______ (slip) over and quickly (15)______ (take) a sip of the water in the "colored only" fountain. When I (16)______ (find) it (17)_______ (be) every bit the same as the water in the "whites only" fountain, I (18)______ (run) back to my parents and (19)______ (shout), "Dad, I just (20)______ (drink) some water from the colored fountain and it (21)_____ (taste) just the same as the other." My father's answer (22)_____ (be) a quick, hard slap. That day I (23)______ (learn) not (24)_____ (question) the difference between black and white.
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