Answer:
1. I know I am <u>irresponsible</u> when I refuse to take care of my children.
2. It is <u>impolite</u> to snub your teacher when she calls you.
3. The law says it is <u>illegal</u> to smuggle drugs into the country.
4. I feel <u>insecure</u> when I walk alone along that path.
5. The <u>imperfect</u> pair of pants was burnt yesterday.
6. Losing something that is <u>irreplaceable</u> can be very painful.
7. One example of an <u>injustice</u> is to imprison an innocent young man.
Explanation:
Looking the underlined words, I have been able to complete the sentences in a way that makes sense.
From the given words, we discover that these words are actually the opposite of their root words:
irresponsible - responsible
impolite - polite
illegal - legal
insecure - secure
imperfect - perfect
irreplaceable - replaceable
injustice - justice