In this area, heavy snow in winter was not uncommon. Sometimes it poured down for hours and hours and piled up very high. Then, no one could go out. Today too, because of the heavy snow, Mom was doing her office work at the kitchen table. Felix, the high schooler, had to take online classes in his room. Five-year-old Sean, who normally went to kindergarten, was sneaking around in the house playing home policeman. (a) The kindergartener wanted to know what his family members were up to, and was checking up on everyone.
* sneak: 몰래 움직이다.

“All right. I’m sure you’re doing your work.” Mom replied, and then sharply added a question. “Sean, what are you doing?” Sean’s face immediately became blank, and he said, “Nothing.” “Come here, Honey, and you can help me.” Sean ran to the kitchen right away. “What can I do for you, Mom?” His voice was high, and Felix could sense that his brother was excited. Felix was pleased to get rid of (b) the policeman, and now he could concentrate on the lesson, at least till Sean came back.

While checking on his family, Sean interfered in their business as if it was his own. This time, (c) the playful and curious boy was interested in his brother Felix, who committed himself to studying no matter where he was. Sean secretly looked inside his brother’s room from the door, and shouted toward the kitchen where Mom was working, “Mom, Felix isn’t studying. He’s just watching a funny video.” Sean was naughtily smiling at his brother.
* naughtily: 짓궂게.

Felix was mad because (d) his little brother was bothering him. Felix was studying science using a video posted on the school web site. He made an angry face at the naughty boy. Right then, Mom asked loudly from the kitchen, “What are you doing, Felix?” Felix’s room was located next to the kitchen, and he could hear Mom clearly. “I’m watching a lecture video for my science class.” Felix argued against Sean’s accusation and mischievously stuck (e) his tongue out at his little brother.
* mischievously: 장난기 있게